Writing and Solving Ratios
Write the ratio as a fraction in simplest form.
12 completions to 28 attempts
3/7
$5.40 for 24 cans
$0.23 for 1 can
28.5 : 42 and 19 : 28
Yes
5/12 = x/36
x = 15
Find the missing dimension. Use the scale 2:5.
Model Actual
Depth: 10km Depth: _____km
25km
Find the missing values.
__ 15 __ __
6 18 36 72
5 15 30 60
6 18 36 72
$1.29 for 20 ounces
$0.06 for 1 ounce
OR
$1 for 15.5 ounces
3.5 : 4 and 11.9 : 13.6
Yes
20/3.4 = 800/y
y = 136
Find the missing dimension. Use the scale 2:5.
Model Actual
Length:5 in Length: _____in
12.5in
Find the missing values.
__ 72 9 __
20 80 __ 40
18 72 9 36
20 80 10 40
50 meters in 27.5 seconds
1.82 meters in 1 second
OR
1 meter in 0.55 seconds
124 to 98 and 315 to 225
No
2.8/r = 70/3
r = 0.12
Find the missing dimension. Use the scale 2:5.
Model Actual
Length: ____ft Length: 24ft
9.6ft
A water pipe leak floods 50 square feet every 1/5 minute. What is the flooded area after 6 minutes.
1500 square feet
There are 16 bacteria in a beaker. Four hours later there are 228 bacteria in the beaker. What is the rate of change per hour (unit rate) in the number of bacteria?
57 bacteria in 1 hour
$24 for 16 burgers and $15 for 10 burgers
Yes
There are 3 referees for every 16 players. Write a proportion that gives the number of referees r for 128 players.
3/16 = r/128
r = 24
Find the missing dimension. Use the scale 2:5.
Model Actual
Diameter: ____m Diameter: 32.5m
13m
Find the ratio of flour to milk and interpret.
Biscuit Recipe
3 cups flour 1/2 cup of water
2/3 cup milk 3/4 cup butter
3:2/3
The amount of flour is 4 1/2 times the amount of milk.
Which has the most protein per calorie?
Calories Protein Fiber Sugar
Bar A 220 20g 12g 14g
Bar B 130 12g 8g 10g
Bar B 0.092 protein per calorie
The seventh grade band has 15 drummers and 12 trumpet players. The eighth grade band has 11 drummers and 9 trumpet players. Do the ratios form a proportion?
No
You need 252 gift bags for an event. You found a gift bag that costs $6.50 for 21 bags. Your budget is $75. Is the gift bag within your budget? Justify your answer.
No, because it would cost $78 for 252 gift bags.
A scale model has a scale of 1ft:8ft. If you are trying to find the model length to an actual of 48ft are these calculations correct, why or why not?
1ft to 8ft = 48ft to x
x=384ft
No, because it is always model over actual. It should be:
1ft to 8ft = x to 48ft
x = 6ft