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Jack usually mows his lawn in 4 hours. Marilyn can mow the same yard in 6 hours. How much time would it take for them to mow the lawn together?

You are under water and you count 40 legs of animals. You come above water and there are ducks and turtles, but a total of 13 of them. How many ducks are there and how many turtles are there?

The following lists the steps a student uses to solve a system of equations but an error has been made. Find and describe the error and correct the answer. 3x-y=14 2x+y=16 5x=20 x=4 3x-y=4 3(4)-4 y=4-12 y=-8 The solution is (4,-8)