Quantitative Aptitude - Arithmetic Ability Questions

Suppose n is a positive integer such that (n2+ 48) is a perfect square. What is the number of such n?

If a person walks at 15 km/hr instead of 9 km/hr, he would have walked 3 km more in the same time. What is the actual distance (in kms) travelled by him? 

If 27% of an electricity bill is deducted, Rs 1825 is still to be paid. How much was the bill?

A shopkeeper marks up his wares by 125% and offers 25% discount. What will be the selling price if the cost price (in Rs) is Rs 640?

If 4x = √5+ 2, then the value of x - 1/16x is

A trader sells two items at the rate of Rs 400 each. If he gains 15% on one and losses 15% on other, then what is the value (in Rs) of loss ?

When a discount of 20% is given on a sweater, the profit is 28%. If the discount is 14%, then the profit is

U and V started a business by investing amounts Rs 184000 and Rs 224000 respectively. If U’s share in the profit received at the end of year is Rs 20700, then what will be the total profit (in Rs)earned by them together?