Cost Calculation Riddle

What is the cost of buying 1 pencil, 1 pen, and 1 eraser?

Final answer: To find the cost of 1 pencil, 1 pen, and 1 eraser, solve the system of equations using substitution or elimination.

To find the cost of 1 pencil, 1 pen, and 1 eraser, we need to solve a system of equations. Let's assign variables to each item: let p represent the price of a pencil, r represent the price of an eraser, and n represent the price of a pen. From the given information, we can set up the following equations:

2p + 2n + r = 0.20

2p + 3n + 3r = 0.41

4p + n + 2r = 0.42

We can solve this system of equations using substitution or elimination to find the values of p, n, and r. Once we have the values, we can add them together to find the cost of 1 pencil, 1 pen, and 1 eraser.