Time and Work :(96) MCQs with Answers

81.

Kiran can complete a work in 45 days. Kishore completes the same work in 40 days. They both started the work Kiran left the work after some days. Kishore completed the remaining work in 23 days. Then after how many days Kiran left the work? 

   A.) After 10 days
   B.) After 7 days
   C.) After 9 days
   D.) After 6 days

Answer: Option 'C'

(x/45) + (x/40) + (23/40) = 1
(x/45) + (x/40) = 1 - (23/40)
(8x + 9x)/360 = 1 - (23/40)
17x/360 = 17/40
x = 9
After 9 days


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