Overview Exercise "I never think of the future. It comes soon enough."
- Albert Einstein
6.
A man completes
Answer: D
Explanation:
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 = 6.
7.
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: D
Explanation:
Let the required weight be x kg.
Less weight, Less cost (Direct Proportion)
:: 60 : x x = (200 x 60)
x =(200 x 60)
250
x = 48.
8.
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: D
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
x = 40 x 1 x 40
x = 40.
9.
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:
Answer: D
Explanation:
Let the required number of revolutions made by larger wheel be x .
Then, More cogs, Less revolutions (Indirect Proportion)
:: 21 : 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: D
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
x = 7 x 1 x 7
x = 7.
of a job in 10 days. At this rate, how many more days will it takes him to finish the job?
x =
250 : 200 :: 60 : x 