Question

Taiwan x years old now

a. How old was 7 years ago.
b. How old will he be 15 years from now?
c. If his age in 15 year will be three times his age 7 years ago, how old is he now

Answer 1

a. x - 7

b. x + 15

c. x + 15 = 3(x - 7)

x + 15 = 3x - 21

2x = 36

x = 18