Velocity km / hr Distance km 9 112 . 5 12 k Find the value of k .

Let us write the given data in a table Velocity ( km / hr ) Distance ( km ) 9 112 . 5 12 k We use the method called direct proportional method. Distance travelled with 9 km / hr velocity is 112 . 5 km . Distance travelled with 1 km / hr velocity is 112 . 5 9 = 12 . 5 km So, with 12 km / hr velocity, the distance travelled is 12 . 5 × 12 = 150 km . Hence, the value of k is 150 .

MEDIUM

8th West Bengal Board

IMPORTANT

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It takes $27$ days to make $1000$ spare parts by $16$ numbers of machines. Let's workout using the Rule of Three method how many days will it take to make the same number of spare parts if additional two machines are installed.

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Important Questions on Rule of Three

MEDIUM

8th West Bengal Board

IMPORTANT

Ganitprabha (MATHEMATICS TEXT BOOK) Class 8>Chapter 10 - Rule of Three>Let's work out - 10.1>Q 8

No. of pens	Cost of pens (in Rupees)
$25$	$112.5$
$12$	$k$

Find the value of $k$ .

MEDIUM

8th West Bengal Board

IMPORTANT

Ganitprabha (MATHEMATICS TEXT BOOK) Class 8>Chapter 10 - Rule of Three>Let's work out - 10.1>Q 8

Velocity $(km / hr)$	Distance $(km)$
$9$	$112.5$
$12$	$k$

Find the value of $k$ .

MEDIUM

8th West Bengal Board

IMPORTANT

Ganitprabha (MATHEMATICS TEXT BOOK) Class 8>Chapter 10 - Rule of Three>Let's work out - 10.1>Q 8

No. of pumps	Total land of cultivation
$6$	$31.2$
$13$	$k$

Find the value of $k$ .

MEDIUM

8th West Bengal Board

IMPORTANT

Ganitprabha (MATHEMATICS TEXT BOOK) Class 8>Chapter 10 - Rule of Three>Let's work out - 10.1>Q 8

Daily allotment of grains to each student (in $gm$ )	Number of students
$306$	$425$
$k$	$458$

Find the value of $k$ to the nearest whole number.

MEDIUM

8th West Bengal Board

IMPORTANT

Ganitprabha (MATHEMATICS TEXT BOOK) Class 8>Chapter 10 - Rule of Three>Let's work out 10.2>Q 1

The work for construction of the village road will be started. It has been decided that

14

people will work

4

hours daily for

15

days to complete the total work. Let's workout using the Rule of three method how many days it will take to complete the work by

24

people working

7

hours daily.

MEDIUM

8th West Bengal Board

IMPORTANT

Ganitprabha (MATHEMATICS TEXT BOOK) Class 8>Chapter 10 - Rule of Three>Let's work out 10.2>Q 2

In a book of

105

pages written by Subhash uncle, there are in average

25

lines in each page and there are in average

8

words in each line. Let's work out using the method of the Rule of Three how many pages will be there in the book if there are

30

lines in each page having

10

words in each line.

MEDIUM

8th West Bengal Board

IMPORTANT

Ganitprabha (MATHEMATICS TEXT BOOK) Class 8>Chapter 10 - Rule of Three>Let's work out 10.2>Q 3

540

Bighas of land of an agricultural farm are to be cultivated in

14

days.

120

Bighas of land was cultivated in first

4

days by

5

tractors of equal strength. Let's work out using the method of the Rule of Three how many tractors will be required to complete the cultivation in time.

MEDIUM

8th West Bengal Board

IMPORTANT

Ganitprabha (MATHEMATICS TEXT BOOK) Class 8>Chapter 10 - Rule of Three>Let's work out 10.2>Q 4

30

heads of people repair

\frac{3}{7}

part of a road of a village in

15

days. How many days it will take to repair the rest of the road if additional

10

heads of people join?

It takes 27 days to make 1000 spare parts by 16 numbers of machines. Let's workout using the Rule of Three method how many days will it take to make the same number of spare parts if additional two machines are installed.

Important Questions on Rule of Three

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It takes $27$ days to make $1000$ spare parts by $16$ numbers of machines. Let's workout using the Rule of Three method how many days will it take to make the same number of spare parts if additional two machines are installed.