72% of the students in a school are boys. If the number of girls in the school is 140, then the number of boys in the school is:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 360
Every student is either a boy or a girl, so the girls make up the remaining 28% of the school. The 140 girls give the total, and the boys are 72% of it.
Girls: \(100\%-72\%=28\%\) of the students \(=140\)
If 28% of the total is 140, the total number of students \(\displaystyle=\frac{140\times100}{28}=500\)
Boys are all the others: \(500-140=360\)