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Lesson Example Discussion Quiz: Class Homework

Step-5

Title: Averages

Grade: 8-a Lesson: S2-L3

Explanation: TODO

Description:

Explanation	Answer
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 ?
Formula used	\$"Average" = "total runs" / "no.of innings"\$
Step - 1	total = Average x no.of innings ⇒ total = 42 x 8 = 336.
Step - 2	Now increase in avg = 6runs.
Step - 3	So, new avg = 42 + 6 = 48runs
Step - 4	Total runs = new avg x new no. of innings = 48 x 9 = 432
Step - 5	Runs made in the 9th inning = 432 - 336 = 96

Explanation

Answer

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 ?

Formula used

\$"Average" = "total runs" / "no.of innings"\$

Step - 1

total = Average x no.of innings

⇒ total = 42 x 8 = 336.

Step - 2

Now increase in avg = 6runs.

Step - 3

So, new avg = 42 + 6 = 48runs

Step - 4

Total runs = new avg x new no. of innings = 48 x 9 = 432

Step - 5

Runs made in the 9th inning = 432 - 336 = 96