Quiz Discussion

Title: Averages

Grade: 8-a Lesson: S2-L3

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 age of 27 kids is 7 years. If the teacher’s age is included, the average age becomes 10 years. Find the teacher’s age.

91

Steps 2

Solve the problem.

The average age of the mother and her two sons is 40 years and that of two sons is 30 years. Find the mother’s age?

60

Steps 3

Solve the problem.

Jack’s average score in the last 8 tests is 70. What should be his score in his next test, so that his average score will be 72?

88

Steps 4

Solve the problem.

The average age of brother and sister is 45. What is the sister’s age if the brother’s age is 50?

40

Steps 5

Solve the problem.

The average of runs of a cricket player of 8 innings was 42. How many runs must he make in his next innings so as to increase his average of runs by 6 ?

96


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