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The answer is 16.. 

think of a number that when you multiply by 3 the answer is 15..15 / 3
the answer is 5 so there must be 5 boys left for the girls to be thrice more than girls.. the question is about how many boys should leave so tou'll just subtract 5 FROM 21
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The answer is 16
you just need to divide 15 to 3 ....15/3
 ur gonna find out that the answer is 5
then u need to subtract 5 from 21
21-5 =16
0 0 0
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