To fill a tank, 25 buckets of water is required. How many buckets of water will be required to fill the same tank if the capacity of the bucket is reduced to two-fifth of its present?
Answer: C
Let required number of buckets \(=x\)
If capacity of buckets are reduced, more number of buckets are required (indirect proportion).
Therefore,
\(25:x=\dfrac{2}{5}:1\\ \Rightarrow 25=\dfrac{2x}{5}\\ \Rightarrow x=62.5\)