Question

E is 5 more than d
f is 7 less than d

work out e-f

Answer 1

12

Explanation:

(5+d)-(d-7)

5--7 = 5+7 = 12

To prove this:

d = 10

e = 5+10 =15

f = 10-7 = 3

15 - 3 =12