Question

On adding 9to twise of a whole number gives 31 find the number

Answer 1

Let the no. be X
So, 9+2X=31
2X=31-9
X=22/2=11

Answer 2

Let the number be x.

2x + 9 = 31

2x = 22

x = 11.

the number is 11.

verification:

22 + 9 = 31.