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UPSC CDS 1 2021 Math Paper
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© examsnet.com
Question : 19
Total: 100
If 20 persons can clean 20 floors in 20 days, then in how many days can 16 persons clean 16 floors?
25 days
24 days
20 days
16 days
Validate
Solution:
👈: Video Solution
let a person can clean 1 unit of floor in one day. then,
20 persons clean 20 floors
≡
20
days
20 persons clean 1 floor
≡
1
day
1 person cleans 1 floor
≡
20
days
1 person cleans 16 floors
≡
20
×
16
days
=
320
days
16 persons clean 16 floors
≡
320
16
days
=
20
days
© examsnet.com
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