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Six Diligence 2010



Sunday, November 1, 2009 ; try this questions

A group of 24 children sold some charity tickets for a charity show.Each ticket was sold at $5.Each boy sold 5 tickets and each girl sold 3 tickets.the boys collected $40 more than the girls.
how many girls were there in the group?
how many tickets were sold altogether?




Answer
i dunno where to get it.find it yourself.haha

Andrew.
i got it wrong for the first time

posted by 6 Diligence at

1 Comments:

Blogger Allan said...

Use guess-and-check also known as listing

Start with boys sold $25 worth of tickets and girls sold $15 worth of tickets

Check with 12 boys and 12 girls.

Every increase of 1 girl and decrease of 1 boy results in $10 difference.

So you'll eventually reach 10 boys and 14 girls.

Those using algebra will have this solution:

Let x be number of boys and y be number of girls

x + y = 24
so x = 24 - y

$25x - $15y = $40 (remove $ sign)

so, 25 times (24-y) - 15y = 40
600 - 25y - 15y = 40
40y = 560
y = 14
so x = 10
10 boys, 14 girls

November 1, 2009 at 9:44 PM  

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