Question

the average of x+3, x+6, x+9, x+12, and x+15 is 15.then find the average of first three numbers.​

Answer 1

Answer:

x+3+ x+6 +x+9/3= 3x+18/3

there fore it gives x+6 and therefore x= -6

Answer 2

Answer:

12

Explanation:

5x+45/5= 15

x= 6

sum of first 3 number is 36

the average of first 3 number is 12