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## Homework Statement

A tank was 3/4 full of oil. 100 litres of oil were then used. If it was then 2/3 full, how many litres does the tank hold when full

## Homework Equations

## The Attempt at a Solution

umm, im not even sure how to get started, i know that 3/4 = 75% and 2/3 = 66.6%

but can't quite wrap my head around it. so yea, i need some help, thanks in advance