- 1.ritchie is three times as old as viper. three years ago, ritchie is
four times as old as viper. find the sum of their age
2.a water tank discharges 1 liter per second of water.how long will it
take to fill 6 gallons container?
hi guys can u help me solve the problems above...thanks
- oh..many thanks erhan...
this one is tough...
" in a family of five children, what is the probability that the first
three are girls?"