The total surface area of a hemisphere is 166.23 sq cm, find its radius?

The product of two positive numbers is 11520 and their quotient is $$9\over5$$.Find the difference of two numbers?

A train runs at a speed of 80km/hr. If the length of the train is 400 m, how long will it take for it to cross an 400m bridge? 

The number 2918245 is divisible by which of the following numbers?

The difference between compound interest and simple interest on a sum for 2 year at 20% per annum is Rs 200. If the interest is compounded half yearly, then what is the difference (in Rs) between compound and simple interest for 15 year? 

When a amount is given at a compound interest rate of 18% per annum, the interest received on compound annual payable in two years will be Rs 960 more than half yearly interest. What is the amount?

25% of 120 + 40% of 380 = ? of 637

How many kilogram of rice costing Rs.60 per kg must be mixed with 24 kg of rice costing Rs.42 per kg so that there may be a gain of 12% by selling the mixture at Rs.56 per kg?