Quantitative Aptitude - Arithmetic Ability Questions

The sum of two numbers is 7 and the sum their squares is 23, their product is equal to:

Which one among the following does not belong to the group?

If a – b = 11 and ab = 24, then value of a2 + b2 is

If a + b = 10 and ab = 21, then the value of (a - b)2 is

If  tan2A / (secA -­ 1)2 = x, then the value of x is

Of the 5 numbers whose average is 76, the first is 3/7 times the sum of other 4. The first number is

A shop keeper allows 20% discount on the marked price on his articles. Find the marked price of an article for which he charges Rs. 740

25% discount is offered on an item. By applying a promo code a customer wins 10% cash back. What is the effective discount?