13 buckets of water fill a tank when the capacity of each bucket is 51 litres. How many buckets will be needed to fill the same tank, if the capacity of each bucket is 17 litres?
33
29
39
42
Explanation:
Capacity of the tank =$(13 \times 51)$ litre.
Number of buckets required when capacity of each bucket is 17 litre
=$\dfrac{13×51}{17}=13×3=39$