Question

a group of four numbers has an average of 15. The first three numbers are 12,19 and 7. What is the other number

Answer 1

22

Explanation:

12 + 19 + 7 + _?_ = 15

38 + _?_ = 15

-38 -38

-----------------------

? = 23

12 + 19 + 7 + 23 = 61

-1

12 + 19 + 7 + 22 = 60

60 ÷ 4 = 15

I hope this helps!