Question

7/15 of the water in a tank which is full is used on one day and 5/6 of the remainder on the next day.if 80 lotres are left , how much water can the tank hold when full.

Answer 1

1st day 7/15 used so 8/15 left

2nd day 5/6 of the remaining is used and 1/6 is left

given, 1/6 = 80 liters

let total was x liters

so, 8/15 of 1/6 of x = 80

x = 80 * 15/8 * 6

x = 900 liters