Question 536792
let 
present age of juan carlos = j


six years ago carlos was = j-6
in 10 years carlos age will be = j+10
then
j+10=3(j-6)
j+10=3j-18
j-3j=-18-10
-2j=-28
-2j/-2=-28/-2
j=14


present age of juan carlos = j = 14 years old