The following table shows the number of units of product produced and sold by a company during six years.

In which two years were the maximum units sold?

A can do a work in 6 days and B can do the same work in 12 days. If A, B and C together can do the same work in 4 days, then in how much days C can do it alone?

A alone can complete a work in 6 days and B alone can complete the same work in 8 days. In how many both A and B together can complete the same work ?

A sum of money amounts to Rs. 4,840 in 2 years and to Rs. 5,324 in 3 years at compound interest (compounded annually). The rate of interests per annum is

Simplify : $$ {(2x)^{2}-(2y)^{2}-(4x)^{2}}$$

The LCM of three different numbers is 120. Which of the following cannot be their HCF? 

The ratio of speeds of A is to B is 2:3 and therefore A takes 20 minutes less time than B takes. What is the ratio of time taken by A and B?

How many positive factors does 325 have?