Algebra
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Let A = the price of 1 apple
Let P = the price of 1 pear
Note: Our goal is to determine the value of A + P
With Bob's purchase, we can write: A + 2P = 18.60
Similarly, with Jerry's purchase, we can write: 2A + P = 16.80
Now add the two equations to get: 3A + 3P = 35.40
Divide both sides of the equation by 3 to get: A + P = 11.80
So, the combined cost of 1 apple and 1 pear cost = $11.80