At the grocery store, you bought a pack of gum for seventy-nine cents, a chunk of

cheese for a dollar and eighty-five cents, and an orange for fifty-six cents. You handed

the checkout person a five-dollar bill. How much change should you receive? To solve

this problem, we will use the Problem Solving Plan. Step one tells us to identify the

information we know and the information we don’t know. We should also use a good

strategy to help organize this information. First, let’s identify our known information. We

know that you bought a pack of gum for seventy-nine cents, a chunk of cheese for one

dollar and eighty-five cents, and an orange for fifty-six cents. Therefore, the total

amount of money you owe is three dollars and twenty cents. We also know that you

paid the checkout person five dollars. We don’t know the amount of change you

received. This is the unknown information the problem asks us to find. Step two of the

Problem Solving Plan tells us to choose variables for our unknowns. The unknown

information in this problem is the amount of change you received from the checkout

person. Let x represent this unknown. Step 3 says we should write an equation that

represents the relationships among the numbers in the problem. Let’s think about this.

The amount of money you pay minus the amount of money you owe equals the amount

of change you should receive. Our equation for this problem is five dollars minus three

dollars and twenty cents equals x. Now, we solve the equation. Five dollars minus three

dollars and twenty cents equals one dollar and eighty cents. X equals one dollar and

eighty cents. Therefore, you should receive one dollar and eighty cents in change. Now,

we should check our work. Replace x with one dollar and eighty cents in the original

equation. Simplify the left side of the equation to get one dollar and eighty cents equals one dollar and eighty cents. The solution is correct.

What does this mean and I really need a lot of help thanks! :)