For the following questions answer them individually
A some of money double itself in 12 years. Find the rate percent per annum of simple interest.
Among four students sitting in a row, average age of last three students is 48 years and the average age of first three students is 50 years. If the age of first student is 56 years, then what is the age of the last student?
12 men can complete a work in 6 days working 4 hours per days. If 4 men work 8 hours per day, then in how many days the same work will be completed?
Solve: $$\left[\left(144/12 \right) + \left(43 \times 3 \right) \right] + 45 - 20 \times 3$$
A can do a work alone in 60 days and B can do the same work alone in 33.33% less time taken by A. Find the time taken by B to complete the work alone.
A some of money at simple interest amounts to Rs. 610 in 3 years and to Rs. 650 in 4 years. The sum is:
If the heights of two cylinders are in the ratio of 7 : 9 and their diameters are in the ratio of 6 : 7, then what is the ratio of the volumes of the cylinders?
A person covers first 15 km in 60 minutes and next 14 km in 30 minutes. What is his average speed for the whole journey?
A sum becomes Rs. 5400 in 4 years at the rate of 20 percent per annum on simple interest. What is the sum?
