(1/6)x + (1/12)x + (1/7)x + 5 + (1/2)x + 4 = x
Answer:x = 84 years.
[25x / 28] + 9 =x
[25x / 28] + 252/28 =x cross multiply
25x + 252 =28x subtract 25x from both sides.
3x=252 divide both sides by 3
x=84
