Solve the following problem. See Example.CHOCOLATE A study found that 7 grams of dark choc...

Solve the following problem. See Example.

CHOCOLATE A study found that 7 grams of dark chocolate per day is the ideal amount to protect against the risk of a heart attack. How many daily servings are there in a bar of dark chocolate weighing 98 grams? (Source: ScienceDaily.com)

Example

Tunneling A tunnel boring machine can drill through solid rock at a rate of 33 feet per day. How many days will it take the machine to tunnel through 7,920 feet of solid rock?

Analyze

In the diagram below, we see that the daily tunneling separates a distance of 7,920 feet into equal-sized lengths of 33 feet. That indicates division.

Form We translate the words of the verbal model to numbers and symbols.

Calculate Use long division to find 7,920 ÷ 33.

State It will take the tunneling machine 240 days to drill 7,920 feet through solid rock.

Check We can check using multiplication.