Question

The average of 7.5, 3.2, 11.3, 20.5 and x is 10. Find the value of x. (a) 5.5 (b) 4 (c) 6.5 (d) 7,5​

Answer 1

Answer:

(d) 7.5

Step-by-step explanation:

Let the required number be x

$\frac{7.5 + 3.2 + 11.3 + 20.5 + x}{5} = 10$

$\frac{42.5 + x}{5} = 10$

$42.5 + x = 10 \times 5$

$42.5 + x = 50$

$x = 50 - 42.5$

$x = 7.5$

Therefore, the value of x is 7.5

Hence, correct option is (d)