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

1 answer:

8 0

X - the volume of the tank

$\frac{4}{5}x+75=x \\
75=x-\frac{4}{5}x \\
75=\frac{1}{5}x \ \ \ |\times 5 \\
x=375$

The tank holds 375 liters when full.

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