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02 Dec 2020, 12:00
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
41% (02:30) correct
59%
(02:30)
wrong
based on 100
sessions
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A man takes 20 days to reach the point B under normal circumstances. But, due to the increasingly hostile weather conditions the distance he travel every day reduces by 20%, starting from day 2. In how many days would the man reach the point B, taking into consideration weather conditions?
A. 25
B. 50
C. 100
D. 125
E. None of these
Are You Up For the Challenge: 700 Level Questions
A. 25
B. 50
C. 100
D. 125
E. None of these
Are You Up For the Challenge: 700 Level Questions
Answer E
let the work be 100%
so every day he did 5% work
and that is reducing by 20% of 5% i.e 1/5
\(5+5(4/5+4^2/5+...)\)
using GP formula for the red part we get 4
5+5(4)= 25% work done so the whole work will not be done
hence answer E
This was the catch...
let the work be 100%
so every day he did 5% work
and that is reducing by 20% of 5% i.e 1/5
\(5+5(4/5+4^2/5+...)\)
using GP formula for the red part we get 4
5+5(4)= 25% work done so the whole work will not be done
hence answer E
This was the catch...
06 Dec 2020, 02:46
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let total Distance =100km
in normal circumstances, distance covered each day= 100/20=5 km
consideration weather conditions = 5 + 5(4/5) = 5 (4/5)(4/5)+...
Sum of GP = a / (1-r) = 5 / 1-(4/5) = 25 days
in normal circumstances, distance covered each day= 100/20=5 km
consideration weather conditions = 5 + 5(4/5) = 5 (4/5)(4/5)+...
Sum of GP = a / (1-r) = 5 / 1-(4/5) = 25 days
