Ratios Introduction — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. A trail mix has peanuts, raisins, and chocolate in a 5:3:2 ratio. In a 100 gram bag, how many grams are peanuts?
A) 50 grams
B) 30 grams
C) 20 grams
D) 60 grams
100 divided by 10 is 10 per part; peanuts are 5 parts, totaling 50.
2. A model train has scale 1:50. The real train is 1500 cm long. How long is the model in centimeters?
A) 50 cm
B) 30 cm
C) 25 cm
D) 75 cm
1500 divided by 50 equals 30 centimeters for the model.
3. A garden uses tulips, roses, and lilies in 4:5:6. Of 60 flowers, how many are lilies?
A) 16 lilies
B) 20 lilies
C) 24 lilies
D) 30 lilies
60 divided by 15 is 4 per part; lilies are 6 parts, totaling 24.
4. A map shows 2 inches equals 30 miles. A 9-inch distance on the map equals how many miles?
A) 120 miles
B) 90 miles
C) 150 miles
D) 135 miles
30 divided by 2 is 15 miles per inch; 15 times 9 equals 135.
Part B: Fill in the Blank
Write the correct answer on each line.
1. Smoothie uses banana, berry, and yogurt in 3:2:5. For 20 oz total, banana is 6 oz.
20 divided by 10 is 2 per part; banana is 3 parts, totaling 6.
2. A scale model uses 1:36. A real bus 540 inches long is modeled at 15 inches.
540 divided by 36 equals 15 inches for the scale model.
3. Mortar uses cement, lime, and sand in 1:1:6. For 24 buckets total, sand needs 18 buckets.
24 divided by 8 is 3 per part; sand is 6 parts, totaling 18.
4. Map scale 1 inch equals 75 miles. Cities 5 inches apart are 375 miles apart in reality.
5 inches times 75 miles per inch equals 375 actual miles.
5. A recipe scaled up uses 4 cups flour for 6 loaves. For 15 loaves, you need 10 cups flour.
4 divided by 6 is 2/3 cup per loaf; 2/3 times 15 equals 10.