The average of 2P, 3Q, and another number is S. Represent the third number in terms of P,Q,and S.

Question

A. S-2P-3Q
B. S-2P+3Q
C. 3S-2P+3Q
D. 3S-2P-3Q
E. S+2P-3Q

not just answer,please

Answer 1

Let x = the third number
It says that the average of 2P, 3Q and x is equal to S. Therefore,
(2P + 3Q + x)/3 = S
Getting x,
2P + 3Q + x = 3S
x = 3S - 2P - 3Q

hope it helps :)

Answer 2

thank you, I understand now.