Mathematics · Pipes and Cisterns
A drainpipe can empty an entire tank in 24 hours, while an inlet pipe can fill an empty tank in 40 hours. A total of 90 pipes, some of them being inlet pipes and the remaining ones being drainpipes, were opened when the tank was completely empty. As a consequence, the tank got completely filled in 4 hours. How many of the 90 pipes were drainpipes?
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