If cost price = Rs.10, selling price = Rs.12  ,then gain or loss =

A vendor bought toffees at 6 for a rupee. How many for a rupee must he sell to gain 20%?

A man will get Rs. 87 as simple interest on Rs. 725 at 4% per annum in

A and B  can together do a piece of work  in 15 days.  B alone can do it in 20 days.  A  alone can do it in

A can do a piece of work in 30 days while  B can do it in 40 days.  A and B  working together can do it in

Profit percentage  =

A sum amounts to Rs. 1352 in 2 years at 4%  compound interest.  The sum is

A speed of 6 m/sec  is the same as :

What must be added to each term of the  ratio 7 : 13 so that the ratio becomes  2 : 3 ? 

If  a : b = 4 : 5  and b : c = 6 : 7, then a : c = _____.