Office Pen

At an office supply store, 3 pencils cost $0.03 more than 2 pens, and 1 pen and 10 pencils toget?

At an office supply store, 3 pencils cost $0.03 more than 2 pens, and 1 pen and 10 pencils togethter cost $2.40.

I’ll assume that you want us to calculate the cost of an individual pen and pencil…

I’ll be using dollars throughout.

Let A be the number of Pens and B be the number of Pencils.

The first condition says: 3B = 2A + 0.03

The second says: A + 10B = 2.4

If i rearrange the second to get: A = 2.4 – 10B, and substitute this into the first, i get:

3B = 2(2.4 – 10B) + 0.03
3B = 4.8 – 20B + 0.03
23B = 4.83
B = 0.21

Now i substitute this into any of the equations.

A = 2.4 – 10B
A = 2.4 – 10(0.21)
A = 2.4 – 2.1
A = 0.30

So a Pen costs $0.30 and a pencil costs $0.21

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