Question

Sum of a number and its half is 30 then the number is ______ 

पर्याय

• 15

• 20

• 25

• 40

Answer 1

20

Explanation;

Hint:

Let number be ‘x’

∴ half of number is `x/2`

Sum of number and it’s half is given by

`x + x/2` = 30 ...[Multiplying by 2 on both sides]

2x + x = 30 × 2

3x = 60

x = `60/3`

= 20