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Aptitude - Problems on H.C.F and L.C.M - Discussion

Discussion Forum : Problems on H.C.F and L.C.M - General Questions (Q.No. 8)
Problems on H.C.F and L.C.M
8.
The G.C.D. of 1.08, 0.36 and 0.9 is:
0.03
0.9
0.18
0.108
Answer: Option
Explanation:

Given numbers are 1.08, 0.36 and 0.90.   H.C.F. of 108, 36 and 90 is 18,

H.C.F. of given numbers = 0.18.

Discussion:
78 comments Page 3 of 8.
Shubham said:   8 years ago
Is it necessary to write .9 as 90/100 instead of 9/10 to get the right answer?
Amit Singh said:   8 years ago
In question, it is 0.9 so how in solution it could be .90? Please explain.
HAROON UR RASHID said:   8 years ago
Yes, we can write 0.9 as 0.90.
Because if we see other given values than after decimal there are two degrees.
Just for making terms we can write 0.9 as 0.90.
Dheeraj Yadav said:   8 years ago
1.08-0.36=0.72.
0.90-0.36=0.54.
(0.72-0.54=0.18).
Krishan kant said:   8 years ago
Why not 0.03?
Sangram said:   8 years ago
1.08= 27/25, 0.36= 9/25 and 0.9= 9/10.
Now,
The formula of hcf of fraction num is:
HCF of numerator / lcm of denominator,
=> hcf of 27,9,9 is 9 and lcm of 25,25,10 is 50,
=> 9/50 = 0.18.
Yogesh said:   8 years ago
The factors of 9 are: 1, 3, 9.

The factors of 36 are: 1, 2, 3, 4, 6, 9, 12, 18, 36.

The factors of 108 are: 1, 2, 3, 4, 6, 9, 12, 18, 27, 36, 54, 108.

Then the greatest common factor is 9. So, the answer should be 0.9.
Rishav said:   7 years ago
Well explained, Thanks @Damini.
Abitha said:   7 years ago
Why finding HCF here? Please explain to me.
SATYAJIT gupta said:   7 years ago
0.09 should be the right answer.
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