exam Maths Puzzle

Ram starts working on a job and works on it for 12 days and completes 40% of the work. To help him complete the work, he employs Ravi and together they work for another 12 days and the work gets completed. How much more efficient is Ram than Ravi?

A.

50%

B.

200%

C.

125%

D.

100%

Read Solution (Total 1)

B. 200%
work by Ram in 12 days 40% or 40/100=2/5, so work in 1 day=2/5*12=1/30
After 12 days work of Ram, work remaining=1-(2/5)=3/5
Remaining work is completed in another 12 days,
so 1 day work of Ram & Ravi=3/5*12=3/60=1/20
If Ravi's 1 day work=1/x, (Ram+Ravi) 1day work=1/30 + 1/x = 1/20 or 1/x=1/60
Efficiency of Ram to Ravi in %=100[(1/30)/(1/60)]=200
10 years agoHelpfull: Yes(3) No(3)

exam Other Question

Ram, who is half as efficient as Krish, will take 24 days to complete a work if he worked alone. If Ram and Krish worked together, how many days will they take to complete the work?

A.

16

B.

12

C.

8

D.

18 Two taps can fill a tank in 12 min and 18 min respectively. Both the taps are kept open for 2 min and then the tap that fills the tank in 12 min is turned off. In how many more minutes will the tank be filled?

A.

9

B.

12

C.

13

D.

10