Full of water

From a tank full of water, a man removed 2/7 of it. If it now contains 450 liters, how many liters does it hold when full?

Correct answer:

V =  630 l

Step-by-step explanation:

V72 V=450  V2/7 V=450  5V=3150  V=53150=630  V=630=630 l

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Showing 2 comments:
Math student
Where did the 5 in the 5V come from?

Dr Math
multiply both sides by 7 to avoid fractions. Then 7V-2V = 5V

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