Quantitative Aptitude - Arithmetic Ability Questions

The simple interest on a sum for 20 years is 5/4 of the principal. What is the per annum rate (in percentage) of interest?

If a + b = 11 and a2+ b2= 61, then value of ab is

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

A man buys 3 type-I cakes and 6 type-II cakes for Rs. 900. He sells type-I cakes at a profit of 15% and type-II cakes at a loss of 10%. If his overall profit is Rs.30, the cost price (in Rs.) of a type-I and of a type-II cakes is

What is the simplified value of sec6 A – tan6 A – 3 sec2 A tan2 A?

The length of the diagonal of a rectangle is 26 cm and that of one side is 10 cm. What is the area of this rectangle?

On a certain item profit is 150%. If the cost price increases by 25% what will be the new profit margin (in %)?

The average weight of 100 students is 32 kg. The average weight of first 49 students is 30 kg and of last 50 students is 34 kg. What is the weight (in kg) of the 50th student?