The ratio of investment of two partners is 11: 12 and the ratio of their profits is 2: 3. If A invested the money for 8 months, find for how much time B invested his money?

A sells a good to B at a profit of 20% and B sells it to C at a profit of 25%. If  C pays Rs. 225 for it, what was the cost price of A?

What is total surface area of a cone where, r’ is radius and ‘l’ is slant height?   

(secA – 1)/(secA + 1) is equal to?

Products pass successively through the hands of three traders and each of them sells his goods at a profit of 30% of his cost price. If the last trader sold the products for Rs.300, then how much did the first trader pay for them? 

A sum becomes 5 times of itself in 3 years at compound interest (interest is compounded annually). In how many years will the sum becomes 125 times of itself?

In an election 10 % of the voters on the voter's list did not cast their votes and 60 voters cast their ballot paper blank. There were only two candidates. The winner was supported by 47 % of all the voters in the list and he got 308 votes more than his rival. The number of voters on the list was 

The perimeter of two squares are 24 cm and 32 cm . The perimeter (in cm) of a third square equal in area to the sum of the areas of these squares is: