Question

If 9a + 9b + 9c = 5, what is 72a + 72b + 72c

Answer 1

40

Explanation:

Divide all three terms of 72a + 72b + 72c by 8. Result: 8(9a + 9b + 9c).

We are told that 9a + 9b + 9c = 5. Thus, 8(9a + 9b + 9c) = 8(5) = 40

Answer 2

40

Explanation:

9a + 9b + 9c = 5

We want 72a

72a/9a = 8 so multiply the first equation by 8

8(9a + 9b + 9c) = 5*8

72a +72b +72c = 40