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Answer

This is a Simultaneous Equation. 

   All   girls  girls  × 4 Girl – All  
A   100 40 160  60  
100 25 100  0  
Total 920   305   1220  300  

60u = 300

1u = 300 ÷ 60 = 5

100u = 100 × 5 = 500 children at A

920 – 500 = 420 children at B

500 – 420 = 80 more children in A 

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Any other method to use?
Why did we multipled by 4?

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25 × 4 = 100

100 – 100 = 0 unit for girl

This will left with the boys units.

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