chain rule aptitude questions – Free Online Questions and Answers

A man completes

of a job in 10 days. At this rate, how many more days will it takes him to finish the job?

7	1
	2

Answer & Explanation

Answer: Option B

Explanation:

Work done =	5
	8

Balance work =		1 –	5		=	3
			8			8

Let the required number of days be x.

Then,	5	:	3	= :: 10 : x		5	x x =	3	x 10
	8		8			8		8

x =		3	x 10 x	8
		8		5

x = 6.

If a quarter kg of potato costs 60 paise, how many paise will 200 gm cost?

A.	48 paise	B.	54 paise
C.	56 paise	D.	72 paise

Answer & Explanation

Answer: Option A

Explanation:

Let the required weight be x kg.

Less weight, Less cost (Direct Proportion)

250 : 200 :: 60 : x 250 x x = (200 x 60)

x=	(200 x 60)
	250

x = 48.

In a dairy farm, 40 cows eat 40 bags of husk in 40 days. In how many days one cow will eat one bag of husk?

Answer & Explanation

Answer: Option C

Explanation:

Let the required number of days be x.

Less cows, More days (Indirect Proportion)

Less bags, Less days (Direct Proportion)

Cows	1	:	40		:: 40 : x
Bags	40	:	1		:: 40 : x

1 x 40 x x = 40 x 1 x 40

x = 40.

A wheel that has 6 cogs is meshed with a larger wheel of 14 cogs. When the smaller wheel has made 21 revolutions, then the number of revolutions mad by the larger wheel is:

A.	4	B.	9
C.	12	D.	49

Answer & Explanation

Answer: Option B

Explanation:

Let the required number of revolutions made by larger wheel be x.

Then, More cogs, Less revolutions (Indirect Proportion)

14 : 6 :: 21 : x 14 x x = 6 x 21

x =	6 x 21
	14

x = 9.

10.

If 7 spiders make 7 webs in 7 days, then 1 spider will make 1 web in how many days?

Answer & Explanation

Answer: Option C

Explanation:

Let the required number days be x.

Less spiders, More days (Indirect Proportion)

Less webs, Less days (Direct Proportion)

Spiders	1	:	7		:: 7 : x
Webs	7	:	1		:: 7 : x

1 x 7 x x = 7 x 1 x 7

x = 7.