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 By: parent603 (offline)  Sunday, July 01 2012 @ 11:57 PM CDT (Read 1086 times)
parent603

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Registered: 11/07/11
Posts: 14

 By: jo sarah (offline)  Monday, July 02 2012 @ 08:28 AM CDT
jo sarah

at first:
Parade grd has 0.4 * 600 = 240 girls
indoor hall has 0.6 * 400 = 240 girls. So, total = 480 girls and 520 boys
in the end:
let no. in parade grd be p and that in indoor hall be i
then, no. of girls: 0.3p + 0.7i = 480 [1]
no. of boys: 0.7p + 0.3i = 520 [2]
so, [1] * 7: 2.1p + 4.9i = 3360 [3]
[2] * 3: 2.1p + 0.9i = 1560 [4]
[3] - [4]: 4i = 1800
thus, i = 450

So that, there are 450 pupils in the indoor hall in the end.

thank you.

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Registered: 03/20/12
Posts: 111

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