Question

Question 9
Riyaz thinks about a number is such a way that if he subtracts 7 from 2½ times of that number, the result comes to be 23 Which number does Riyaz think.

Answer 1

∴Riyaz thinks 12.

Step-by-step explanation:

Given Riyaz thinks about a number is such a way that if he subtracts 7 from $2\frac{1}{2}$ times of that number , the result comes to be 23.

Let the number be x.

According to the problem,

$x\times 2\frac{1}{2} -7 = 23$

$\Leftrightarrow \frac{5x}{2} -7 =23$

$\Leftrightarrow \frac{5x}{2} =23 +7$

$\Leftrightarrow x =\frac{30 \times 2 }{5}$

$\therefore x =12$

∴Riyaz thinks 12.