Question 418196
darrel is half as old as he will be when he is three times as old as he was four years ago.
how old is he?
:
let a = his present age
a = .5(3(a-4))
a = .5(3a - 12)
a = 1.5a - 6
6 = 1.5a - a
6 = .5a
a = 12 his present age
:
:
Check solution in original equation
12 = .5(3(12-4))
12 = .5(3*8); confirms our solution