Question 1149348
Josh is 36 years old.
 Josh was twice as old as Justin was when Josh was as old as Justin is now.
 How old is Justin now?
:
let j = Justin's present age
let d = 36 - j,  the difference in their ages
:
"Josh was twice as old as Justin was when Josh was as old as Justin is now."
36 - d = 2(j - d)
36 - d = 2j - 2d
36 = 2j - 2d + d
36 = 2j - d
replace d with 36 - j
36 = 2j - (36 - j)
36 = 2j - 36 + j
36 + 36 = 2j + j
72 = 3j
j = 72/3
j = 24 yrs is Justin's age