Multiple choice

Two persons A and B under take to do a piece of work for Rs. 4800. A could do it alone in 5 days and B could do it alone in 8 days. With the help of C and D they finished it in 3 days. If the alone work of C be twice that of 'D', the share of D is

  1. Rs. 60

  2. Rs. 20

  3. Rs. 40

  4. Rs. 80
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Work done by A in 3 days = 3/5. Work done by B in 3 days = 3/8. Work done by C and D = 1 - (3/5 + 3/8) = 1 - (24+15)/40 = 1 - 39/40 = 1/40. C = 2D, so 3D = 1/40, D = 1/120. Share of D = (1/120) * 4800 = 40.

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