Working 8 hours a day, 12 men can do a work in 30 days. Working 4 hours a day, 18 men can do the work in `30\ d a y s` b. `40\ d a y s` c. `45\ d a y s` d. `50\ d a y s`

3 men or 6 women can do a piece of work in 20 days. In how many days will 12 men and 8 women do the same work? 3 1/2d a y s b. 3 3/4d a y s c. 4\ d a y s d. 5\ d a y s

12 men of 15 women can do a work in 40 days. 8 men and 10 women can do the work in how many days?

12 men or 18 woman can do a work in 16 days. In how many days 12 men and 18 woman can do the work?

A can do a piece of work in 15 days, which B can do in 10 days. B worked at it for 8 days. A can finish the remaining work in 2 d a y s b. 3 d a y s c. 5 d a y s d. 10 d a y s

If M1 men can do W1 work in D1 days working H1 hours per day and M2 men can do W2 work in D2 days working H2 hours per day then

10 men working 8 hours day can do a work in 30 days. In how many days will 12 men working 4 hours a day take do the same work?

Some persons can do a piece of work in 12 days. Two times the number of such persons will do half of that work in 6\ d a y s b. 4\ d a y s c. 3\ d a y s d. 12\ d a y s