Math MCQ Part-7

A dealer buys an article at a discount of 20% on its list price and marks it at 25% above the list price. If he allowsa 20% discount on the new list price, then his profit per cent is :

If A : B is 2:3 and B-A = 28, what is the value of (B + A) ?

If A's income is 60% less than B's income, then B's income is what percentage more than that of A's income ?

A mixture of acid and water Contains 20 percent acid. When 10 litres of water is added to the mixture, then the percentage of acid becomes 15 percent. What is the original quantity of mixture ?

Find the smallest number which should be added to the smallest number divisible by 6, 9 and 15 to make it a perfect square.

The average age of a husband and his wife was 23 years at the beginning of their marriage. After five years they have a one-year old child. The average age of the family of three, when the child was born, was

20 workers can paint 24 walls in 36 days. In how many days can 30 workers paint 20 walls ?

A sum becomes Rs. 8800 in 4 years at simple interest at the yearly interest rate of 25% per annum. What is the sum (in Rs.) ?

Find the principal amount if the interest compounded annualy at the rate of 10% for two years is Rs. 4,200.

Sam bought 20 dozens of toys at the rate of Rs. 480 per dozen. He sold each toy for Rs. 42. What was his profit per cent ?