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4/5 part of a tank is filled with oil. After taking out 42 litres of oil the tank is 3/4 part full. What is the capacity (in litres) of the tank?
Let capacity of tank = $$x$$ litres
According to ques,
=> $$\frac{4x}{5}-42=\frac{3x}{4}$$
=> $$\frac{4x}{5}-\frac{3x}{4}=42$$
=> $$\frac{16x-15x}{20}=42$$
=> $$x=42\times20=840$$
$$\therefore$$ Capacity (in litres) of the tank = 840 litres
=> Ans - (C)
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