Arithmetic Reasoning第 13 / 120 题
In a class of 30 students, 3/5 are girls. How many boys are in the class?
a.12
b.10
c.15
d.18
解析
Three fifths of 30 is 18 girls. Subtracting 18 girls from 30 total students leaves 12 boys. The fraction of boys is the remaining two fifths of 30, which also equals 12.
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