Unit 3 Test

Front

What is the percentage of students who are 11 years old if 40% are 13 years old and 50% are 12 years old in a group of 140 students?

Back

10% of the students are 11 years old.

Front

How do you calculate the speed of a boat if it travels 14 miles in 30 minutes?

Back

Speed = Distance/Time. Convert 30 minutes to hours (0.5 hours). Speed = 14 miles / 0.5 hours = 28 miles per hour.

Front

If George runs 10 laps in 15 minutes, how do you find the time taken for 1 lap?

Back

Time per lap = Total time / Number of laps = 15 minutes / 10 laps = 1.5 minutes.

Front

What percentage of 20 pieces of fruit are oranges if 5 of them are oranges?

Back

Percentage of oranges = (Number of oranges / Total fruit) * 100 = (5 / 20) * 100 = 25%.

Front

How do you find the number of students who are 11 years old from a total of 140 students with given percentages for 12 and 13 year olds?

Back

Calculate the number of 12 year olds (50% of 140 = 70) and 13 year olds (40% of 140 = 56). Then, 140 - (70 + 56) = 14 students are 11 years old.

Front

What is the formula to calculate percentage?

Back

Percentage = (Part / Whole) * 100.

Front

If a boat travels 14 miles in 30 minutes, how do you convert that speed to miles per hour?

Back

Multiply the speed in miles per minute by 60 to convert to miles per hour.

Front

What is the relationship between distance, speed, and time?

Back

Distance = Speed x Time.

Front

How do you determine the average time per lap if you know the total time and number of laps?

Back

Average time per lap = Total time / Number of laps.

Front

What is the total number of students if 40% are 13 years old, 50% are 12 years old, and the rest are 11 years old?

Back

Total students = 140.