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Option 4 : 80
Given:
The total students in school initially = 400
The new students join school = 100
Calculation:
Let us assume the new boys be X
⇒ The boys initially = (3/5) × 400 = 240
⇒ The girls initially = (2/5) × 400 = 160
⇒ The new strength of the class = 400 + 100 = 500
⇒ The boys in school after admission = (16/25) × 500 = 320
⇒ The new boys = X = 320 - 240 = 80
∴ The required result will be 80.
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