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Solving Expressions and Equations

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Rafael is filling up a 150 gallon tank. He is pouring the water at rate 2.5 gallons per minute.

a) Write an expression that represents how many gallons Rafael has poured since he began.
b) Write an equation that represents how long it will take for the tank to be 1/2 full.
c) Solve the equation in part c and say what your answer represents.
d) How many minutes does it take for the gallon to be all the way full?

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The expert solves expressions and equations.

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a. Number of gallons n = 2.5 x t

If t be the number of minutes that the person is filling the tank, then ...

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