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McGraw-Hill Math Grade 7 Answer Key Lesson 20.2 Changing from Metric Units to Customary Units
Exercises
CONVERT
Question 1.
If each person on a hike is supposed to carry 1.75 liters of water, how many gallons of water would you need to bring for a group of 45 people?
Answer:
20.8 gallons,
Explanation:
If each person on a hike is supposed to carry 1.75 liters of water,
1 gallon = 0.264 liters,
1.75 L = 0.264 x 1.75 = 0.462 Gallon,
Number of gallons of water would need to bring for a group of 45 people,
0.462 x 45 = 20.8 gallons.
Question 2.
Every camper is served .15 kilograms of cereal each morning. If there are 12 campers, how many pounds of cereal will you need to bring for a 7-day trip?
Answer:
27.8 lb,
Explanation:
Every camper is served .15 kilograms of cereal each morning.
If there are 12 campers,
0.15 x 12 = 1.8 kg,
Total number of pounds of cereal would need to bring for a 7-day trip,
1.8 x 7 = 12.6 kg,
1 kg = 2.205 pounds,
12.6 kg = 2.205 x 12.6 = 27.783 or 27.8 lbs.
Question 3.
11 kilograms is about how many ounces?
Answer:
388.1 oz,
Explanation:
1 kg = 35.274 ounce,
11 kg = 35.274 x 11 = 388.1 oz.
Question 4.
A 3-meter diving board is how many feet above the pool?
Answer:
9.84 ft,
Explanation:
1 meter = 3.280 feet,
3 m = 3.280 x 3 = 9.84 ft.
Question 5.
A 15-meter length of rope is how many feet long?
Answer:
49.2 ft,
Explanation:
1 meter = 3.280 feet,
15 m = 3.280 x 3 = 49.2 ft.
Question 6.
A dog weighs 22 kilograms. How many pounds is that?
Answer:
48.5 lb,
Explanation:
1 kg = 2.205 pounds,
22 kg = 2.205 x 22 = 48.5 lb.
Question 7.
A 50-meter pool is the standard size for the Olympics. What is that length in feet?
Answer:
164.04 ft,
Explanation:
1 meter = 3.280 feet,
50 m = 3.280 x 50 = 164.04 ft.
Question 8.
A reservoir contains 11,250,000 kiloliters of water. How many gallons is that?
Answer:
2,961,000,000.
Explanation:
1 kiloliter = 263.2 gallons,
11,250,000 kiloliters = 263.2 x 11,250,000 = 2,961,000,000 gallons.
Question 9.
The local middle school sponsored a 6-kilometer race for everyone to run. What is the length of the race in miles?
Answer:
3.726 miles,
Explanation:
1 kilometer = 0.621 miles,
6 kilometers = 0.621 x 6 = 3.726 miles.
Question 10.
A jet that travels at 4,200 kilometers per hour is traveling how many miles per hour?
Answer:
2608.2 miles per hour.
Explanation:
A jet that travels at 4,200 kilometers per hour.
1 kilometer = 0.621 miles,
4200 kilometers = 0.621 x 4200 = 2608.2 miles per hour.
Question 11.
How many inches is 300 centimeters? How many feet?
Answer:
118.2 inches; 9.9 ft.
Explanation:
1 centimeter = 0.394 inches,
300 cm = 0.394 x 300 = 118.2 inches,
1 centimeter = 0.0328Â feet,
300 cm = 0.0328 x 300 = 9.9 ft.
Question 12.
The average defensive lineman on the football team at Bloomingdale High School weighs 110 kilograms. The average offensive lineman weighs 240 pounds. Which position has a lower average weight?
Answer:
The offensive linemen have a lower average weight.
Explanation:
The average defensive lineman on the football team at Bloomingdale High School weighs 110 kilograms.
Convert kilograms to pounds,
1 kg = 2.205 pounds,
110 kg = 110 x 2.205 = 242.55 pounds,
The average offensive lineman weighs 240 pounds.
When compare both the offensive linemen weighs least.