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 By: adilah9 (offline)  Saturday, February 18 2012 @ 12:41 PM CST (Read 918 times)

Q5)
Class A and Class B have the same number of pupils. The ratio of the number of boys in Class A to the number of boys in Class B is 3:2. The ratio of the number of girls in Class A to the number of girls in Class B is 3:5. Find the ratio of the number of boys in Class A to the number of girls in Class B.

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Registered: 09/19/11
Posts: 12

 By: shanmugamshanthi (offline)  Saturday, February 18 2012 @ 05:51 PM CST
shanmugamshanthi

total number of boys and girls in both class remain same,so it is total unchanged concept

class A
B:G
3:3 *7
21:21

CLass B
B:G
2:5 *6
12:30

total must be same ,now the total units in Class A and Class B is 42 units.

class AB:Class B G
21:30
7:10

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Registered: 12/31/06
Posts: 5

 By: adilah9 (offline)  Saturday, February 18 2012 @ 08:49 PM CST

Quote by: shanmugamshanthi

total number of boys and girls in both class remain same,so it is total unchanged concept

class A
B:G
3:3 *7
21:21

CLass B
B:G
2:5 *6
12:30

total must be same ,now the total units in Class A and Class B is 42 units.

class AB:Class B G
21:30
7:10

That's what I worked out too. Except the answer's 6:5

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Registered: 09/19/11
Posts: 12

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