There are 48 students in a certain class, 25% of this are girls, How many boys are in the class?
1 answer:
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n = 15
the nth term of an arithmetic sequence is = a₁ + (n-1)d
where d is the common difference
d = a₂ - a₁ = 6 - 2 = 4
= 2 + 4n - 4 = 58
4n - 2 = 58
4n = 60 ( divide both sides by 4 )
n = 15