Book Maths Puzzle Area and Volume

A tank is supplied by two pipes A and B and emptied by a third pipe C. If the tank is empty and all pipes are opened the tank can be filled in 20 hours. If the tank is full and A

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Book Other Question
The amount (by weight) of gold, silver and lead in three alloys of these metals are in the ratios:

4:3:2; 3:5:1; and 2:2:5.

It is desired to make a fourth alloy containing e 43,000 is 80% of what number? How do you figure this problem type?