Write an Equation

1
Write an Equation
COURSE 3 LESSON 5-3
An old formula for making polish calls for 1
part of boiled linseed oil for every 3 parts of
turpentine. How much linseed oil is needed to
make 10 cups of the polish?
5-3
2
Write an Equation
COURSE 3 LESSON 5-3
(continued)
linseed oil turpentine ratio 1
3 unknown amounts 1a
3a
5-3
3
Write an Equation
COURSE 3 LESSON 5-3
(continued)
5-3
4
Write an Equation
COURSE 3 LESSON 5-3
To paint a cabinet purple, you are going to mix
red, blue, and white paint in a ratio of 3 5
8. To make a gallon of paint, how many ounces of
each color will you use?
5-3
5
Write an Equation
COURSE 3 LESSON 5-3
(continued)
5-3
6
Write an Equation
COURSE 3 LESSON 5-3
(continued)
Substitute 8 for p in the expression for each
color. red 3(8) 24 oz    blue 5(8) 40
oz    white 8(8) 64 oz
5-3
7
Write an Equation
COURSE 3 LESSON 5-3
Write an equation to solve each problem. Show
your equation and your answer. 1. A punch recipe
calls for 3.5 qt fruit juice to 2.5 qt soda
water. You want 18 qt of punch in all. How much
fruit juice do you need? 2. A painter is
mixing white, yellow, and red in a ratio of 4 3
1. He needs 2 gallons. If there are 128
ounces in a gallon, how much white is needed?
3.5x 2.5x 18 10.5 qt
4p 3p p 2(128) 128 oz, or 1 gal
5-3