Explanation

Let number of boys be "x" and number of percent 60%. If 60% are boys in a school then, 40% are girls in a school. Total amount of students = (x + 120)

60% of (x+120) is boys (x)

\(\frac{60}{100} \times (x + 120) = x\)

\(\frac{3}{5} \times (x+120) = x\)

\(3 x+360=5 x\)

\(2 x=360\)

\(x=180\)

So, number of boys are 180

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