Multiple choice

If 450 men can finish construction of an apartment in 20 days, then how many men are needed to complete the same work in 30 days?

  1. 150

  2. 300

  3. 400

  4. 250
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is an inverse variation problem where the product of men and days remains constant (total work = 450 × 20 = 9000 man-days). To complete in 30 days, men needed = 9000/30 = 300. More days means fewer men required.

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