Question 992943
j = juan's current age in years
m = marry's current age in years
g = george's current age in years


"mary is three years older than juan" means {{{m = j+3}}}


"george is twice as old as mary" so we know {{{g = 2m}}}


Replace the 'm' in george's equation with 'j+3' to get {{{g = 2(j+3) = 2j+6}}}


So currently, george is {{{2j+6}}} years old.


Add 10 years to this expression to get {{{2j+6+10=2j+16}}}


In 10 years, george will be <font color="red">2j+16</font> years old, where j is juan's current age. So the answer is <font color="red">d) 2j +16</font>