Pepe's pizza makes 52 pizza crusts the first week and 180 pizza crusts each subsequent week. Dianne's Delicatessen makes 26 pizza crusts the first week and 90 pizza crusts each subsequent week. In how many weeks will the total number of pizza crusts made by Pepe's Pizza equal twice the total number of pizza crusts made by Dianne's Delicatessen?

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29-09-2016
Mathematics

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Pepe's pizza makes 52 pizza crusts the first week and 180 pizza crusts each subsequent week. Dianne's Delicatessen makes 26 pizza crusts the first week and 90 pizza crusts each subsequent week. In how many weeks will the total number of pizza crusts made by Pepe's Pizza equal twice the total number of pizza crusts made by Dianne's Delicatessen?

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Аноним Аноним · Answer 1 · 2016-10-12T09:58:45+02:00

Let pn = The total number of pizza crusts made by the end of the nth week

For Pepe's Pizza:
Pn + 52 + 180n

For Diannes's
Pn = 25 + 90n

The total number of pizza crusts made by Pep's Pizza equals twice the total number of pizza crusts made by Dianne's Delicatessen when:
52 + 180n = 2 (26 + 90n)
52 + 180n = 52 + 180n

This equation is satisfied for any value of n, so Pepe's always makes twice as much as Dianne's