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a tank 4/5 full needs 75 litres to fill it up.how many litres does it hold when full

Sagot :

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x - the volume of the tank

[tex]\frac{4}{5}x+75=x \\ 75=x-\frac{4}{5}x \\ 75=\frac{1}{5}x \ \ \ |\times 5 \\ x=375[/tex]

The tank holds 375 liters when full.
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