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 Rosyth School CA1 2011 Paper 2- Help
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By: adilah9 (offline)  Saturday, February 18 2012 @ 12:41 PM CST (Read 882 times)  
adilah9

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

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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