IXL | Unit rates: word problems

Joy is making hand-painted ornaments for her family this year. Yesterday, she made 2 ornaments in 6 hours. This weekend, she plans to spend a total of 15 hours making ornaments.

If Joy works at the same rate, how many ornaments will she make this weekend?

ornaments

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Learn with an example

question

Michael's mom loves Bright Scents candles. A 4-inch candle will burn for 8 hours. Michael bought his mom a 10-inch candle for Mother's Day.

If Bright Scents candles all burn at the same rate, how many hours will the 10-inch candle burn?

hours

solution

It takes 8 hours to burn a 4-inch candle. Write this as a rate.

8 hours

4 inches

Divide the numerator and denominator by 4 to find the unit rate.

8 hours

4 inches

2 hours

1 inch

A Bright Scents candle burns at a rate of 2 hours per inch. You need to find how many hours it will take the 10-inch candle to burn. Write a proportion.

2 hours

1 inch

? hours

10 inches

Compare the denominators.

2 hours

inch

? hours

inches

To get from 1 to

10,

multiply by

10.

Multiply the numerator and denominator by 10 to find the number of hours it will take for the 10-inch candle to burn.

2 hours

1 inch

hours

10 inches

The 10-inch candle will burn for 20 hours.

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Lesson: Ratios

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