Xand Y together can construct a small quarantine center in 12 days, which X alone can
construct in 30 days. In how long Y alone can construct it?
A
B
20
21
с
D
18
19
Answers
Given:
X and Y together can construct a small quarantine center in 12 days,
X alone can construct in 30 days
To find:
In how long Y alone can construct it?
Solution:
In 1 day, the part of quarantine centre X and Y will construct → =
In 1 day, the part of quarantine centre X alone will construct → =
Let's assume that Y can alone construct the quarantine centre in "Y" days.
Therefore,
In 1 day, the part of quarantine centre X alone will construct,
=
=
taking L.C.M of 12 & 30 = 60
=
=
=
Thus, Y alone can construct the small quarantine centre in 20 days.
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