Multiple choice

Anita and Bindu can do a job in 16 days and 12 days respectively. 4 days before finishing the job, Anita joins Bindu. If Bindu has started the work alone. Find how many days Bindu has worked alone?

  1. 6

  2. 7

  3. 8

  4. 5
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Bindu alone days = d, together 4 days. Bindu's work: d/12 + 4/12 + 4/16 = 1. d/12 + 1/3 + 1/4 = 1. d/12 + 7/12 = 1. d/12 = 5/12. d = 5 days. The key is understanding that Bindu worked alone for 5 days, then both worked together for 4 days to complete the job.

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