13 buckets of water fill a tank when the capacity of each bucket is 42 litres. How many buckets will be needed to fill the same tank, if the capacity of each bucket is 6 litres?	Answers
A) 91	B) 80	C) 96	D) 98	E) 90

Rationale: "capacity of the tank = ( 13 ã — 42 ) litre number of buckets required of capacity of each bucket is 17 litre = 13 ã — 42 / 6 = 13 ã — 7 = 91 answer is a"
Answer: A