21. Venu is now 14 years older than Renu. In 10yrs Venu will be twice as old as Renu, how old will Venu be in 5 years?
Sol: Let, V=age of venu, R=age of Renu,
V=R+14
V+10=2(R+10)
V=2R+10
R+14=2R+10
T=90 ==41hrs.
R=4
V=4+14=18 years
V+5=23years.