Quantitative Aptitude - Arithmetic Ability Questions

A and B are positive integers. If A + B + AB = 65, then what is the difference between A and B (A, B ≤ 15)?

A man borrowed some money from a private organisation at 5% simple interest per annum. He lended this money to another person at 10% compound interest per annum, and made a profit of 26,410 in 4 years. The man borrowed

If two successive discounts of 20% and 30% are given, then what is the net discount (in %)?

Ruchir walks at 20 km/hr and Rukma cycles at 25 km/hr towards each other. What was the distance between them when they started if they meet after 48 minutes?

If a retailer offers a discount of 20% on the marked price of his goods and thus ends up selling at cost price, what was the % mark up?

If 1 shirt is offered free on purchase of 4 shirts, what is the effective discount (in %) on each shirt?

Two numbers are 50% and 75% lesser than a third number. By how much percent is the second number to be enhanced to make it equal to the first number?

How many times the keys of a typewriter have to be pressed in order to write numbers from 121 to 1346?