Page 55 - Concepts of Reasoning-8

CHAPTER

Worksheet-11.1 Proportion 11

Direct Proportion

1. State whether the following statements are true or false :

a. The brightness of the light is directly proportional to its distance from the source. ______
b. The frictional force is directly proportional to the roughness of the surface. ______

c. The premium amount is inversely proportional to the insured amount. ______
d. Displacement of the liquid will be inversely proportional to the density of the substance. ______

e. The acceleration of the particle is inversely proportional to the time since it is fired. ______

2. Choose the values for x and y among the given numbers such that they form the direct proportion.
One has been done for you :
3, 4, 5, 6, 7, 8, 9, 10, 12, 27, 36, 30 and 40

x 3
y 4

3. Solve the following word problems :

a. If the cost of 4 kg of apples is `200, how many kg of apples can be bought for `500?
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b. If a reader reads 30 pages in 75 minutes, how many pages can he read in 125 minutes?
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c. If 20 people can build 45 metres of wall in 5 days, what is the height of the wall build by the same
number of people in 3 days?
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d. 50 persons can repair a road in 5 days, working 3 hours a day.In how many days will 25 person,
working 6 hours a day, complete the work?

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e. A recipe requires 5 cups of flour for every 2 cups of sugar. If I want to make a recipe using 15 cups
of flour, how much sugar do I need?

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55 Reasoning - 8