Sunday, February 28, 2010 ; Math Weekly
Dear pupils,
This is due on Thu and will be issued on Mon.
| Term 1 Week 8 (1 variable changed, 2 or more variables changed) | |
| 1) | In a city, 60% of the taxis were owned by Company A and the rest by Company B. After buying another 80 taxis, Company B now owns 52% of all the taxis in the city. How many taxis does Company B have now? |
| 2) | Among the 80 stickers that Sue has collected, 55% of them are round and the rest are oval. After giving away some round stickers, the percentage of round stickers she has reduces to 40%. How many round stickers does Sue have left? |
| 3) | Mrs Lee prepares 1 litre of syrup drink. 10% of the drink is syrup and the rest of it is water. How many millilitres of syrup must she add to the 1-litre drink to increase its syrup content to 50%? |
| 4) | In a community library, the ratio of the number of English books to that of Japanese books is 4 : 1. If 25% of the English books and 2/5 of the Japanese books are loaned out, the library will have a total of 1620 books left. How many English books does the library have? |
| 5) | An institution organised a 2-day conference. On the first day, the number of male participants was 700 more than the number of female participants. On the second day, the number of male participants decreased by 10% but the number of female participants increased by 5%. Given that there were 1995 participants on the second day, how many participants were there on the first day? |
| 6) | Bryan, Daniel and Kelvin went shopping with a total of $715. Bryan spent 20% of his money, Daniel spent $40 and Kelvin spent twice as much as Bryan. If there is a total of $465 left, how much money did Daniel and Kelvin have altogether at first? |
| 7) | Flexible Thinking Training: 40% of Amy's money is the same as 50% of Bala's money. Form 6 statements on fraction and 6 on %. |
Regards,
Mr Wan
posted by Allan at
4:11 PM
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Thursday, February 25, 2010 ; Speed of Animals
If you're a busybody and stumble onto this page during Comp Lab session, you're in for a surprise.
The table below shows the speed of some animals.
| Animal | Speed (km/h) |
| Black mamba snake | 32 |
| Cat (domestic) | 48 |
| Cheetah | 113 |
| Chicken | 14 |
| Elephant | 40 |
| Garden snail | 0.05 |
| Giant tortoise | 0.27 |
| Giraffe | 51 |
| Gray fox | 68 |
| Grizzly bear | 48 |
| House mouse | 13 |
| Human | 45 |
| Hyena | 64 |
| Kangaroo | 48 |
| Lion | 80 |
| Ostrich | 64 |
| Peregrine falcon | 322 |
| Pig (domestic) | 18 |
| Pronghorn antelope | 98 |
| Rabbit (domestic) | 56 |
| Reindeer | 51 |
| Spider | 1.88 |
| Squirrel | 19 |
| Zebra | 64 |
Arrange these animals from the fastest to the slowest using any possible method and you'll gain your group 300 points. This challenge is only valid for the first 3 accurate groups who email me at mr_allan_wan@yahoo.com.sg
Each group can only email me once. If a second member of the group emails me, it'll be an automatic disqualification.
You may want to keep quiet about this challenge and inform your group members through quiet means. Shhhh......
Regards,
Mr Wan
posted by Allan at
12:18 AM
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Wednesday, February 17, 2010 ; Article of the week
SINGAPORE : Singapore needs to consider different options to diversify its energy sources, so as to make the country less vulnerable to price fluctuations and supply disruptions.
Some of the options to consider include importing coal and electricity. Another is to conduct a study on the possibility of having nuclear energy in the distant future.
A sub-committee under the Economic Strategies Committee came up with these proposals and released its report on Thursday.
Currently, about 80 per cent of Singapore's electricity is generated by gas-fired power plants.
To ensure energy security, the sub-committee suggested that Singapore should develop a smart energy economy.
Proposals to achieve that include developing Jurong Island as an energy-optimised industrial cluster, investing in critical energy infrastructure and further developing renewable energy sources like solar and biomass.
The sub-committee also suggested that the government consider refining the existing Green Vehicle Rebate such that it is based on the actual fuel efficiency or carbon emissions of the vehicle, which it currently does not take into account.
It also proposed that existing funding for research and development in energy be expanded to about S$500 million over five years.
The sub-committee pointed out that as traditional energy sources like oil and gas are limited, energy prices may increase in future. So having different energy options will be essential to ensure supply reliability and to better manage price volatility.
S Iswaran, chairman of the Economic Strategies Sub-Committee, and Senior Minister of State for Trade & Industry, said: "By enhancing the mix of sources available to us, we want to make sure there are competitive options available for industries and Singaporeans.
"If any one source has issues, there are other sources that can come in and pick up the slack. And overall, the system will be able to continue and the energy price will be competitive."
Using nuclear energy to generate electricity is another possible option. In fact, the sub-committee said countries like Vietnam and Thailand have announced plans to build nuclear power plants in the next decade, while Malaysia and Indonesia are considering this option.
The sub-committee made it clear that it is only proposing that Singapore begins to study the feasibility of having nuclear energy. It reiterated that this is a long-term plan for 10 years and beyond.
The key, it added, is that Singapore keeps abreast of the nuclear energy developments as well as to consider the different energy sources for the distant future.
Experts said studying the nuclear energy option is a good decision, and Singapore must find a nuclear generator that's safe for the country.
Importing electricity will also help Singapore's energy security.
"The best thing for Singapore is to consider investing in the country from which it is going to import (electricity from). By doing this, it can be certain that for example, through a joint venture with that country, create a type of generator which is environmentally-friendly," said Dr Hooman Peimani, head of Energy Security, Energy Studies Institute, NUS. - CNA /ls
posted by 6 Diligence at
5:08 PM
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Sunday, February 14, 2010 ;
Happy Chinese New Year..
Wish u all happy valentines too... 
posted by Zi Jun at
11:31 AM
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Wednesday, February 10, 2010 ; Quake hits Solomon Islands
HONIARA - A STRONG, 6.3-magnitude earthquake struck near the Solomon Islands in the western Pacific on Saturday, seismologists said, but there was no immediate tsunami warning or reports of damage.
The US Geological Survey said the quake was measured at a depth of about 35 kilometres and struck 146 kilometres southeast of the town of Gizo at 4.51pm (0551 GMT, 1.51pm Singapore time).
Two aftershocks, one of 5.0 magnitude, the other 5.4, followed about two hours later.
Like much of the Pacific, the Solomons regularly experiences earthquakes. A string of earthquakes rocked the western Solomon Islands late Tuesday and early Wednesday, with the largest recorded at 6.9-magnitude, followed by five aftershocks.
The tremors followed a series of quakes on Monday, with the largest one of 7.2 causing a tsunami estimated at nearly 2.5 metres. Around 1,000 people - almost a third of the population - are believed to have been left homeless on Rendova island due to earthquake and tsunami damage.
In April 2007, an 8.0-magnitude earthquake in the western Solomons triggered a tsunami that killed more than 50 people and displaced thousands. Gizo harbour lost most of it wharves and jetties in the quake and subsequent tsunami. -- AFP
posted by 6 Diligence at
6:38 PM
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