A tray of cookies is arranged in 3 rows. Each row has pp more cookies than the row in front of it. There are 5p5p cookies in the last row. How many cookies are there in the front row? Give your answer in terms of pp in the simplest form.

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Worked solution

2

1. Determine the number of cookies in the second row

The last row (3rd row) has 5p5p cookies. Since each row has pp more cookies than the row in front of it, the 2nd row has 5p−p=4p5p - p = 4p cookies.

2. Determine the number of cookies in the front row

The front row (1st row) has pp fewer cookies than the 2nd row. So, the front row has 4p−p=3p4p - p = 3p cookies.

Answer

3p3p

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