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. A pen and 12 erasers cost $17.70. A pen and 15 erasers cost $20.40. How much do 6 pens cost?

Question

. A pen and 12 erasers cost $17.70. A pen and 15 erasers cost $20.40. How much do 6 pens cost?
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Solution 1

Sure, let's solve this step by step:

Step 1: Let's denote the cost of a pen as P and the cost of an eraser as E. From the problem, we have two equations:

P + 12E = 17.70 ...(equation 1)

P + 15E = 20.40 ...(equation 2)

Step 2: To find the cost of each item, we can subtract equation 1 from equatio Knowee AI is a powerful AI-powered study tool designed to help you to solve study problem.

Knowee AI  is a powerful AI-powered study tool designed to help you to solve study problem.
Knowee AI  is a powerful AI-powered study tool designed to help you to solve study problem.
Knowee AI  is a powerful AI-powered study tool designed to help you to solve study problem.
Knowee AI  is a powerful AI-powered study tool designed to help you to solve study problem.
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