Question 575149
When Ricky was 10 years old, his father was 45.How many years must pass for Ricky to be 5 years older than 1/5 as old as his father? 
sol:
consider it as now,ricky = 10
                   father= 45
after x years ricky = 10 + x ------ (1)
              in terms of father's age ricky = 1/5*(45+x) + 5 ------(2)
after x years ricky will be 5 years older than 1/5 of fathers
    equate 1 & 2 
you will get x = 5.