Question

The average of four numbers is 15 i three of those numbers are 7,9 an 16 find the last number

Answer 1

Answer:

$the \: number \: = 28$

Step-by-step explanation:

$\frac{x + 7 + 9 + 16}{4} = 15 \\ \\ x + 32 = 15 \times 4 \\ x + 32 = 60 \\ x = 60 - 32 = 28 \\ \\ the \: number \: = 28$