Ley the current age of Krishna and yuvansh as-
Krishna - k
Yuvansh- y
1. Four years ago -
K-4=3(Y-4)
K-4=3y-12
Which gives k=3y-8
2. One year ago -
K-1=2(y-1)
Which gives k=2y-1
Solving eqn 1 and 2 it gives
Y=7
Substitute in the eqn to find
K=13
The diff is k-y= 13-7 = 6
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