Solve the equation: {1/4 + 5/8} + {1/2 + 3/4} = ?

A) 35/32

B) 10/7

C) 5/12

D) 17/8

Given : {1/4 + 5/8} + {1/2 + 3/4} = ?

Solving it by applying BODMAS  

            {1/4 + 5/8} + {1/2 + 3/4} = ?

                                     7/8 + 5/4= ?

                                    ⇒ ? = 17/8

Complete the number series: 15, 31, 63, 127, 255, …?

A) 513

B) 511

C) 523

D) 517

The logic of this series is: The next number would be double of current number plus 1

Example: The next number of 15 would be (15 x2) + 1 i.e. 31

The next number would be (31x 2) + 1 i.e. 63. And so on ….

Hence answer is: (255×2) + 1 i.e. 511