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Lesson Example Discussion Quiz: Class Homework

Quiz Discussion

Title: Averages

Grade: 8-a Lesson: S2-L4

Explanation: Hello students, let us discuss few problems on this topic with steps and answers provided for each problem.

Quiz: Discussion in Class

Problem Id	Question	Description	Answer
Steps 1	Solve the problem.	The average of a list of 7 numbers is 23. If we remove one of the numbers, the average of the remaining numbers is 18. What is the number that was removed?	53
Steps 2	Solve the problem.	All of the members of the family are very tall. Their heights are 51 inches, 48 inches, 41 inches, 45 inches. What is the average height of the 4 members?	46.25 inches
Steps 3	Solve the problem.	The average of twelve positive numbers is 18. If the average of the first four numbers is 12 and that of the last four numbers is 30. What is the average of the remaining four numbers?	12
Steps 4	Solve the problem.	The average of three students ages is 32 years. The ratio between first student age and second student age is 27:10. If the third is 2 more than the second. What is the sum of the first and second students ages?	74
Steps 5	Solve the problem.	The average weight of P, Q and R is 60kgs. Weight of Q is 20 kgs less than P’s weight and 5kgs more than R’s weight. What will be the average P, Q, R and S, if S weighs 2 kgs more than R ?	58

Problem Id

Question

Description

Answer

Steps 1

Solve the problem.

The average of a list of 7 numbers is 23. If we remove one of the numbers, the average of the remaining numbers is 18. What is the number that was removed?

Steps 2

Solve the problem.

All of the members of the family are very tall. Their heights are 51 inches, 48 inches, 41 inches, 45 inches. What is the average height of the 4 members?

46.25 inches

Steps 3

Solve the problem.

The average of twelve positive numbers is 18. If the average of the first four numbers is 12 and that of the last four numbers is 30. What is the average of the remaining four numbers?

Steps 4

Solve the problem.

The average of three students ages is 32 years. The ratio between first student age and second student age is 27:10. If the third is 2 more than the second. What is the sum of the first and second students ages?

Steps 5

Solve the problem.

The average weight of P, Q and R is 60kgs. Weight of Q is 20 kgs less than P’s weight and 5kgs more than R’s weight. What will be the average P, Q, R and S, if S weighs 2 kgs more than R ?