Find the missing number in 16, 33, 65, 131, 261, _____

Answer: 523

Explanation:

Each number is twice the preceding one with 1 added or subtracted alternatively.

So, the next number is (2 x 261 + 1) = 523.

Read More

Student A has secured 9 marks more than student B and A's marks was 56% of the sum of A&B's marks. The marks obtained by A and B are??

Answer: 

42,33

Explanation:

Let their marks be (x + 9) and x.

Then, x + 9 =	56	(x + 9 + x)
	100

 25(x + 9) = 14(2x + 9)

 3x = 99

 x = 33

So, their marks are 42 and 33.

Read More