F&C 3: Proportions Word Problems

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Front

How do you solve a proportion?

Back

To solve a proportion, cross-multiply the two ratios and then solve for the unknown variable.

Front

What is the ratio of red paint to yellow paint in Kevin's paint mixing problem?

Back

The ratio of red paint to yellow paint is 3:5.

Front

If Kevin mixes 9 oz of red paint, how much yellow paint should he mix?

Back

He should mix 15 oz of yellow paint.

Front

How do you find the time it takes to read a book using proportions?

Back

Set up a proportion comparing pages read to time taken, then solve for the unknown time.

Front

If you read 146 pages in 3 hours, how long will it take to read 390 pages?

Back

It will take approximately 8 hours.

Front

What is the cost of one bunch of grapes if 4 bunches cost $10?

Back

The cost of one bunch of grapes is $2.50.

Front

How many bunches of grapes can you buy with $25?

Back

You can buy 10 bunches of grapes.

Front

What is the relationship between the number of pizzas and sticks of pepperoni in Pat's problem?

Back

The relationship is a direct proportion; more pizzas require more sticks of pepperoni.

Front

If 14 sticks of pepperoni are needed for 28 pizzas, how many are needed for 36 pizzas?

Back

18 sticks of pepperoni are needed for 36 pizzas.