This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Let capacity of bucket = x litre
then capacity of tank = 25*x = 25x litre

if capacity of bucket is reduced to 2/5 of its present,
capacity of bucket = (2x/5)litre

no. of buckets of water required to fill the tank =  \frac{25x}{2x/5} = \frac{25x}{2x}*5= \frac{25*5}{2} = 62.5\ buckets

62.5 buckets of water will be required to fill the same tank