70% of the boys of a school play football and 80% of the boys play hockey. if the number of boys who play football is 322 more than the number of boys who play hockey find the number of boys in the school
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in a class, 30% of the boys play football, 40% remaining play cricket and the remaining 21 boys play different other games. how many boys are there in the class?
number of boys = x
boys playing football = 30% of x = 3x/10
if your question is right, we’ll calculate the number of boys playing cricket from the remaining. so, remaining boys = x — 3x/10 = 7x/10
40% of these boys play cricket, i.e. 40% of 7x/10
= 28x/100
atq, 3x/10 + 28x/100 + 21 = x
=>(30x + 28x + 2100)/100 = x
=> 58x + 2100 = 100x
=> 42x = 2100
=> x = 50
total number of boys = 50 :)
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