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Question

Answer

There are 285 children.

If there are 10u girls, there are (285 – 10u) boys

Given

10u * 75% = ( 285 – 10u ) * 20%

1ou * 3/4 = ( 285 – 10u ) /5                                               multiply both sides by 20

150u =  4( 285 – 10u )

150u = 1140 – 40u 

190u = 1140

u = 6

10u = 60

285 – 60 = 225

225- 60 = 165

There are 165 more boys than girls

 

 

Check:

225 /5 = 45

60 * 3/4 = 45                 Checked.

 

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