Question 71468
40+X=2(14+X)
40+X=28+2X
X-2X=28-40
-X=-12
X=12 YEARS FROM NOW  DAD WILL BE 
40+12=52 & 
JACK WILL BE 14+12=26 
THUS IN 12 YEARS DAD WILL BE TWICE AS OLD AS JACK
2*26=52