• Numerical Ability - Time & Work
Question

A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is:

  • A) 1/4
  • B) 1/10
  • C) 7/15
  • D) 8/15
  • E) None of these
Solution

Ans.4

A’s 1 day’s work = 1/15


B’s 1 day’s work =1/20


(A + B)’s 1 day’s work = [1/15+1/20] = 7/60

(A + B)’s 4 day’s work = [7/60 × 4] = 7/15

Therefore, Remaining work = [1 ? 7/15 ] = 8/15

Ans.4

A’s 1 day’s work = 1/15


B’s 1 day’s work =1/20


(A + B)’s 1 day’s work = [1/15+1/20] = 7/60

(A + B)’s 4 day’s work = [7/60 × 4] = 7/15

Therefore, Remaining work = [1 ? 7/15 ] = 8/15
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