Question
The diameter of the base of a cylindrical drum is 21 dm
and the height is 12 dm. It is full of petrol. How many tins each of size 15 cm × 11 cm × 20 cm can be filled with petrol from the drum?Solution
1 dm = 10 cm 
x × volume of 1 tin = volume of cylinder x × 15 × 11× 20 = 22/7 × 210/2 × 210/2 × 120 x = 1260
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