To fill a tank, 100 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 four-fifth of its present ?
Choices:
A) 100
B) 125
C) 150
D) 175
E) 200
Let the capacity of 1 bucket = x.   Then, the capacity of tank = 100x.   New capacity of bucket = 4/5 x   Therefore, Required number of buckets = (100x)/(4x/5)   = (100x) x 5/4x   = 500/4= 
<gadget id="calculator">500/4</gadget>
<output>125</output>
125   Answer is 125.
<result>B</result>
To fill a tank, 100 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 four-fifth of its present ?