If 80 lams can be lighted 5 hours per day for 10 days for Rs. 21.2 then the number of lams which can be lighted 4 hours daily for 30 days, for Rs. 76.50 is `100` b. `120` c. `150` d. `160`

If 4 men can reap a field in 5 days working 12 hours a day, in how many days can 10 men reap the same field working 8 hours a day?

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?

30 labourers working 7 hours a day can finish a piece of work in 18 days.If the labourers work 6 hours a day,then the number of labourers to finish the same piece of work in 30 days,will be: 15 b.21 c.22 d.25

24 men working 8 hours a day can finish a work in 10 days. Working at the rate of 10 hours a day, the number of men required to finish the same work in 6 days is:

12 men working 8 hours per day complete a piece of work in 10 days.To complete the same work in 8 days,working 15 hours a day, the number of men required is a.4 b.5 c.6 d.8

In a house three bulbs of 100w each are lighted for 4 hours daily and six tube lights of 20 W each are lighted for 5 hours daily and a refrigerator of 400 W is worked for 10 hours daily for a month of 30 days. Calculate the electricity bill if the cost of one unit is Rs 4.00