New Mathematics Today Class 7>Chapter 26 - Average>Mental Maths>Q 1

MEDIUM

7th ICSE

IMPORTANT

Earn 100

The average height of $8$ girls in a class is $158 cm$ . If a new girl joins the group, the average heights becomes $157 cm .$ Find the height of this ninth girl. Write the answer in $cm$ .

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Important Questions on Average

EASY

7th ICSE

IMPORTANT

New Mathematics Today Class 7>Chapter 26 - Average>Mental Maths>Q 2

The average of three numbers is

17 .

If two of them are

14

and

21

. Find the third number.

MEDIUM

7th ICSE

IMPORTANT

New Mathematics Today Class 7>Chapter 26 - Average>Mental Maths>Q 3

Find the average of first ten odd natural numbers.

MEDIUM

7th ICSE

IMPORTANT

New Mathematics Today Class 7>Chapter 26 - Average>Mental Maths>Q 4

Find the average of the first five multiples of

2 .

HARD

7th ICSE

IMPORTANT

New Mathematics Today Class 7>Chapter 26 - Average>Challenge !>Q 1

A car travelled at

60 km / h

for

4

hours and then at

90 km / h

for next two hours. If its average speed in

A km / h

, then find the value of

A

.