SOLUTION: Three pipes A,B and C in a tank. They can fill the tank in 10 hrs, 20 hrs and 25 hrs respectively. At first all of them are opened simultaneously. After 2 hrs,tap C is closed and

Question 843603: Three pipes A,B and C in a tank. They can fill the tank in 10 hrs, 20 hrs and 25 hrs respectively.
At first all of them are opened simultaneously.
After 2 hrs,tap C is closed and A and B are kept running.
After 4 hrs, tap B is also closed. The remaining work is done by Tap A alone.
Find the percentage of the work done by Tap A by itself.
Found 2 solutions by Azeez majiyagbe, richwmiller:
Answer by Azeez majiyagbe(1) (Show Source): You can put this solution on YOUR website!
5x+3y=6
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
2/10+2/20+2/25+4/10+4/20+x/10=1
x = 1/5 hour
.2/10=.02 or 2%
A did 2% of the work alone
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