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Dan and Julio can mow a lawn in 12 minutes. Julio can mow the lawn by himself in 10 minutes less time than it takes Dan by himself. How long does it take each of them to mow the lawn alone?

A chemist dilutes a 32% saline (salt) solution with water (0% saline) in order to produce 150 liters of 20% saline solution. How much water and how much 32% solution does she need to use?

Torrey painted some signs yellow and the rest red. The number of yellow signs was 5 less than 3 times the number of red signs. Furthermore, 6 times the number of red signs was 70 less than 10 times the number of yellow signs. How many signs were yellow and how many...