Question

If the mean of the data x+3, 2x+6 is 15, then the value of x is​

Answer 1

Answer:

x=7

Step-by-step explanation:

=x+3+2x+6/2=15

=3x+9=15×2

=3x+9=30

=3x=30-9

=3x=21

=x=21/3

=x=7

Answer 2

Answer:

$\frac{x + 3 + 2x + 6}{2} = 15 \\ 3x + 9 = 15 \times 2 \\ 3x + 9 = 30 \\ 3x = 21 \\ x = 7$