# The Mean of 18, 24, 15, 2x + 1 and 12 is 21. Find the Value of X. - Mathematics

Sum

The mean of 18, 24, 15, 2x + 1 and 12 is 21. Find the value of x.

#### Solution

Mean of given data =(18 + 24 + 15 + 2x + 1 + 12)/(5)

⇒ 21 = (70 + 2x) / (5)

⇒ 5 x 21 = 70 + 2x

⇒15 = 70 + 2x

⇒ 2x = 105 - 70

⇒ 2x = 35

⇒ x = 35/2

⇒ x = 17.5

Concept: Properties of Mean
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#### APPEARS IN

Selina Concise Mathematics Class 9 ICSE
Chapter 19 Mean and Median (For Ungrouped Data Only)
Exercise 19 (C) | Q 2 | Page 241