Question

Pipe 'a' can fill 12 litres per minute and pipe 'b' can fill 6 litres per minute. Pipe 'c' can empty a drum in 10 minutes. When all the three pipes are opened, the drum is filled in 15 minutes. What is the capacity of drum?

Answer 1

answer is 12 or not

Answer 2

LET THE CONTAINER CONTAIN X LTR

12+6 LTR FILL IN 1 MIN

AT SAME TIME

THE CONTAINER EMPTY IN 10 MIN

AS A RESULT IN 1 MIN EMPTY X/10

AS PER THE QUESTION

THE CONTAINER FILL IN 15 MIN

THE EQU IS

18-X/10=X/15

=>18=X/15+X/10

=>18=(2X+3X)/30

=>5X=18×30

=>X=18×30/5

=>X= 18×6=108