SSC CHSL 10 Jan 2017 Shift 2 Paper

Question : 79 of 100

Marks: +1, -0

Amar is 2 times as good a workman as Badal and therefore is able to finish a job in 15 days less than Badal. In how many days can they together complete the job?

30 days
40 days
10 days
20 days

Validate

Solution:

Ratio of times taken by Amar and Badal = 1 : 2
The time difference is (2 - 1) 1 day while Badal take 2 days and Amar takes 1 day.
If difference of time is 1 days, Badal takes 2 days.
If difference of time is 15 days, Badal takes =

2/1×15=30

days
So, Amar takes 30 days
Amar's 1 day's work =

1/15

Badal's 1 day's work =

1/30

(Amar + Badal)'s 1 day's work together =

1/30 +1/15 =3/30 =1/10

∴ Amar and Badal together can do the work in = 10 days

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