IBM Company Numerical Ability Time and Work

Four skilled workers do a job in 5 days, and five semi-skilled workers do the same job in 6 days. How many days will it take for two skilled and one semi-skilled worker to do that job?

Read Solution (Total 2)

Ans: 15/2 days
Exp:
4 skilled in 5 day
2 .......... 10 day

5 semi-skilled in 6 days
1 ............... 30 days

2 skilled & 1 semi skilled in one day = 1/10 + 1/30 =2/15 work
hence, 2/15 work in 1 day
so, 1 work will be 15/2 days Ans
11 years agoHelpfull: Yes(16) No(1)

Ans is 7 1/2 days
11 years agoHelpfull: Yes(5) No(2)

IBM Other Question

Brittany needs a mixture of 76% oats and 24% corn. She currently has 25 pounds of a mixture that is 28% oats. How many pounds of oats should be added to the mixture? A tyre has punctures. The first puncture alone would have made the tyre flat in 9 minutes and the second alone would have done it in 6 minutes. If air leaks out at a constant rate, how long does it take both the punctures together to make it flat?
A. 1x1/2 minutes B. 3x1/2 minutes
C. 3x3/5 minutes D. 4x1/4 minutes