Question

Riyaz thinks about a number is such a way that if he subtracts 7 from 2 1/2 times of that number the result comes to be 23. Which number does Riyaz think.

Answer 1

Let Riyaz think a number x.

According to question,

2 1/2 × x – 7 = 23

⇒ 5/2 = 23 + 7

⇒ 5/2 x = 30

⇒ x = (20 x 30)/5 = 12

So the number thinked by Riyaz is 12.