(A) 26
(B) 28
(C) 32
(D) 34
Correct Option is: D
John has completed 1/4 of the work in 9 days
Then he can complete the total work in
1/4 —- 9
1 —- ?
= 36 days
But given Michael is only 80% as efficient as John
Michael = 1/36*80/100=1/45
Michael can complete the total work in 45 days
Now, remaining ¾ of work can be completed in
1 —— 45
3/4 —— ?
=3/4*45 =33.75=34 days (approx.)