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2015-03-29T08:48:00+08:00

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Given:


To answer this one, we need variables.

Let:

  x       = sales for the 1st year

x+3     = sales for the 2nd year

2(x+3) = sales for the 3rd year


Sales for the 3rd year = 38 million $


Asked: Sales for the 1st year in millions of dollars


Mathematical Sentence:

            2 (x +3) = 38

            x = ?

Solution:

                2 (x +3) = 38

                2x + 6  = 38

                2x   = 38 - 6

               2x = 32

               x = 16


Answer:

         The 1st year sales in million dollars that is equal to x is 16 million dollars.


Check:

            If 1st year is really 16 million dollars then,

2nd year = 1st year + 3 million dollars = 16 + 3 = 19 million dollars

3rd year = twice 2nd year = 19 x 2 = 38 million dollars, CORRECT


Final answer:    16 million dollars



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