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Initially there are 7u boys and 8u girls

So 7u + 8u = 300
=> 15u = 300
=> u = 20

So there were originally 140 boys and 160 girls.

Then, 36 boys left and x girls arrived.

So,

5(140 – 36) = 2(160 + x)
520 = 320 + 2x
2x = 200
x = 100 #

1 Reply 2 Likes ✔Accepted Answer

Thank you very much. 

0 Replies 1 Like