state gov MP Forest Guard and Jail Prahari Mock Test 2023 Quantitative Aptitude Time and Work Pipe and Cistern
In total, 10 identical pipes are attached to a water tank. Some of them fill the water while others drain out the water. Each pipe can fill or empty the tank in 20 minutes alone. When all pipes are open, the tank gets completely filled in 10 minutes. How many pipes are there that drain out the water?
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