Two pens are bought at the rate of Rs 20 each. Shopkeeper sells one at the profit of 25% and other at the loss of 25%. What will be the total profit or loss in the whole transaction?

An equal sum is invested in two different schemes. One scheme gives simple interest and the other gives compound interest (annual compounding). The total interest obtained after 2 years from both the schemes together is Rs 2090. If both the schemes have 18% per annum interest rate, then what is the first year interest (in Rs) of simple interest scheme?

In which of the following situations is mechanical energy most likely to be conserved?

Which type of electromagnetic radiation has the shortest wavelength?

A boy buys 5 pencils at Rs 3 each, 3 erasers at Rs 2 each and 3 sharpeners at Rs 5 each. What is the average expenditure (in Rs) per article?

P and Q invested some money in a business in the ratio of 4 : 7 respectively. After 6 months P withdraws his capital. If they receive profits in the ratio of 4 :21, then for how many months did Q invest in the business?

The ratio of two numbers is 3 : 7. If their product is 1344, then what is the sum of both the numbers?

If U = 450 and V = 585, then V is how much percentage more than U?