Question

Ram can finish a work in 18 days while Bhaskar would have completed the same work in 15 days. Bhaskar worked for 10 days and left the job. Under this situation, Ram would take _______ days to finish the remaining work.
1. 5 days
2. 6 days
3. 7 days
4. 8 days

Answer 1

Correct Answer - Option 2 : 6 days

Given 

Ram can finish the work = 18 days 

Bhaskar completed the work = 15 days 

Formula Used 

Work = Time × Efficiency 

Calculation 

LCM of (18,15) = 90 

Let the total work be 90 

Efficiency of Ram = 90/18 = 5/day

Efficiency of Bhaskar = 90/15 = 6/day

Bhaskar can do work in 10 days = 6 × 10 = 60 

Remaining work by Ram in days = (90 - 60)/5 = 6 days 

∴ The required answer is 6 days