Multiple choice

If the work done by (x-1) men in (x+1) days is equal to the work done by (x+2) men in (x-1) days are in the 9:10, then x is equal to-

  1. 5

  2. 6

  3. 7

  4. 8
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Work = Men × Days. The ratio is (x-1)(x+1) : (x+2)(x-1) = 9:10. Canceling the common factor (x-1) gives (x+1)/(x+2) = 9/10. Cross-multiplying: 10(x+1) = 9(x+2), which simplifies to 10x + 10 = 9x + 18, so x = 8.

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