Question

Pat bought several pens at Walgreen’s, for 60 cents each. Spending the same amount of money at the Bookstore, Pat then bought some pens that cost 80 cents each. In all, 42 pens were bought. How many pens did Pat buy at the bookstore

Answer 1

The number of pens he bought at the bookstore is 18.

How many pens did he buy at the bookstore?

The first step is to determine the system of equations that represent this situation:

x + y = 42 equation 1

60x = 80y

x = 80y / 60

x = 8/6y equation 2

Where:

x = number of pens bought at Walgreen

y = number of pens bought at the bookstore

Now, substitute for x in equation 1:

8/6y + y = 42

1 2/6 + y = 42

2 1/3y = 42

7/3y = 42

y = 42 x 3/7

y = 18

To learn more about system of equations, please check: brainly.com/question/15936743

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