Answer: Base numbers are the number of units, or numbers, we use in our counting system, also called a number system. The most common base number is ten because the digits 0-9 are used in the number system. In other words, whenever we want to tell a number to someone we don't use any numbers besides 0-9. If it was a base-5 number system we would only use five different digits, like 0-4.
Vol of water required to fill up the tub = 12-3 = 9 Rate of water per min = 3 -1.5 = 1.5/min Using the formula vol = rt t = v/r t = 9/1.5 = 6 time taken = 6 mins
