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Pediatricians prescribe milliliters (ml) of acetaminophen for every pounds of a child’s weight. How many milliliters of acetaminophen will the doctor prescribe for Emilia, who weighs pounds?
12 ml
For every kilogram (kg) of a child’s weight, pediatricians prescribe milligrams (mg) of a fever reducer. If Isabella weighs kg, how many milligrams of the fever reducer will the pediatrician prescribe?
180 mg
One brand of microwave popcorn has calories per serving. A whole bag of this popcorn has servings. How many calories are in a whole bag of this microwave popcorn?
| Identify what you are asked to find. | How many calories are in a whole bag of microwave popcorn? |
| Choose a variable to represent it. | Let number of calories. |
| Write a sentence that gives the information to find it. | If there are 120 calories per serving, how many calories are in a whole bag with 3.5 servings? |
| Translate into a proportion. |
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| Substitute given values. |
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| Multiply both sides by 3.5. |
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| Multiply. |
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| Check if the answer is reasonable. | |
| Yes. Since 3.5 is between 3 and 4, the total calories should be between 360 (3⋅120) and 480 (4⋅120). | |
| Write a complete sentence. | The whole bag of microwave popcorn has 420 calories. |
Marissa loves the Caramel Macchiato at the coffee shop. The oz. medium size has calories. How many calories will she get if she drinks the large oz. size?
300
Yaneli loves Starburst candies, but wants to keep her snacks to calories. If the candies have calories for pieces, how many pieces can she have in her snack?
5
Josiah went to Mexico for spring break and changed dollars into Mexican pesos. At that time, the exchange rate had U.S. is equal to Mexican pesos. How many Mexican pesos did he get for his trip?
| Identify what you are asked to find. | How many Mexican pesos did Josiah get? |
| Choose a variable to represent it. | Let number of pesos. |
| Write a sentence that gives the information to find it. | If $1 U.S. is equal to 12.54 Mexican pesos, then $325 is how many pesos? |
| Translate into a proportion. |
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| Substitute given values. |
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| The variable is in the denominator, so find the cross products and set them equal. |
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| Simplify. |
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| Check if the answer is reasonable. | |
| Yes, $100 would be $1,254 pesos. $325 is a little more than 3 times this amount. | |
| Write a complete sentence. | Josiah has 4075.5 pesos for his spring break trip. |
Yurianna is going to Europe and wants to change dollars into Euros. At the current exchange rate, US is equal to Euro. How many Euros will she have for her trip?
590 Euros
Corey and Nicole are traveling to Japan and need to exchange into Japanese yen. If each dollar is yen, how many yen will they get?
56,460 yen
Previously, we solved percent equations by applying the properties of equality we have used to solve equations throughout this text. Some people prefer to solve percent equations by using the proportion method. The proportion method for solving percent problems involves a percent proportion. A percent proportion is an equation where a percent is equal to an equivalent ratio.
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