Quantitative Aptitude - Arithmetic Ability Questions

An 80 litre mixture of water and acid contains 20% acid. How much acid should be added to make the acid 60% in the new mixture?

Abhishek marks the price of his laptop 60% above the cost price. If he gives a discount of 30% on the marked price, then what is the profit percentage?

On selling 56 chairs, Mohan earns profit equal to the selling price of 6 chairs. What is the profit percentage?

If (x - 4) (x2 + 4x + 16) = x3 - P, then P is equal to

If 123 x 356 = 43788, then 1.23 x 0.356 = ?

Area of _____ equals square of its side.

The area of a circle is 616 sq.m. Find its diameter.

If sin (3x ­ 20°) = cos (3y + 20°), then find the value of (x + y).