MEDIUM
8th West Bengal Board
IMPORTANT
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There are two motors of 5 Hp and 3 Hp in a factory. The 5 Hp motor requires 20 units of electricity in 8 hours. How many units of electricity will be required if the 3 Hp motor works for 10 hours?

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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 10.2>Q 7
In a loom at Gopalnagar 14 weavers can weave 210 sarees in 12 days. The workshop got an order to supply 300 sarees within 10 days during the Pujas. How many extra weavers have to be employed to complete the work 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 8
A Company has got the work of unloading goods from a ship in 10 days. 280 heads of people have been employed for this purpose After 3 days it is seen that 14th of the work has been completed. Let's work out using the method of the Rule of Three how many heads of people are to be engaged to complete the work 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 9
A Power-loom is 214 times more powerful than a hand-loom. 12 hand-looms weave 1080 meters length of cloth in 18 days. How many power-looms will be required to weave 2700 meters length of cloth in 15 days?
MEDIUM
8th West Bengal Board
IMPORTANT
Ganitprabha (MATHEMATICS TEXT BOOK) Class 8>Chapter 10 - Rule of Three>Let's work out 10.2>Q 10
2400 Bighas of land of a Cooperative Society can be cultivated by 25 farmers in 36 days. It was seen that half of the land of the Society could cultivate in 30 days after purchasing a tractor. Work out the power of a tractor equivalent to the number of farmers using the method of Rule of Three.
MEDIUM
8th West Bengal Board
IMPORTANT
Ganitprabha (MATHEMATICS TEXT BOOK) Class 8>Chapter 10 - Rule of Three>Let's work out 10.2>Q 11
A ship takes 25 days to sail from Kolkata to Cochin. The ship started with 36 sailors for each of which 850 gm of food was allotted. But the ship rescued 15 sailors from another sinking-ship after 13 days of journey and the ship reached Cochin in 10 days increasing the speed. Let's work out using the method of the Rule of Three what will be the quantity of food to be consumed by of each sailor to reach Cochin safely and the entire storage of food would be consumed by this 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 12
36 heads of people of a certain village can construct 120 meters of road working 6 hours daily in 12 days. Another 6 heads of people are involved in this work and the duration of work of each day is increased by 2 hours. Work out using the method of the Rule of Three the length of road to be constructed in 9 days.
MEDIUM
8th West Bengal Board
IMPORTANT
Ganitprabha (MATHEMATICS TEXT BOOK) Class 8>Chapter 10 - Rule of Three>Let's work out 10.2>Q 13
250 heads of people can dig a pond of size 50 meters long, 35 metres wide and 5.2 metres deep in 18 days by working 10 hours daily. How many days it will take for 300 people to dig a pond of size 65 metres long, 40 metres wide and 5.6 metres deep by working 8 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 14

Find out the value of k by the Rule of Three:

Power HP Time hour Electric (unit) consumption
5 8 20
3 10 k