Verified Answer :

mumsy

we can write b= boys, and g= girls

we know that girls are equal g=(2b-5)
we also know that b+g=40
we will replace girls with the above equation and get
b+ (2b-5) = 40 , 2b=2b
b+2b= 40+5
3b=45, divide everything by 5
b=15
girls are 215-5=25
15+25=40

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