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Junior Regional Olympiad - FBH 2017 Grade 6 Problem 2

Source:

September 20, 2018
milkequation

Problem Statement

In three cisterns of milk lies 780780 litres of milk. When we pour off from first cistern quarter of milk, from second cistern fifth of milk and from third cistern 37\frac{3}{7} of milk, in all cisterns remain same amount of milk. How many milk is in cisterns?