Question #25388

A rectangular tank containing some pebbles was 80% filled with water.When all the pebbles were removed, the water level dropped to 25% of its original height.The volume of the water left in the tank was 3 litres.
a)Find the capacity of the tank.
b)If the volume of each pebble is 60 cm3,how many pebbles were there in the tank.

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