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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. 21)
Problems on H.C.F and L.C.M
21.
The greatest possible length which can be used to measure exactly the lengths 7 m, 3 m 85 cm, 12 m 95 cm is:
15 cm
25 cm
35 cm
42 cm
Answer: Option
Explanation:

Required length = H.C.F. of 700 cm, 385 cm and 1295 cm = 35 cm.

Discussion:
42 comments Page 4 of 5.
Gopi krishna said:   1 decade ago
How we can find factors for such numbers?
Renuka said:   1 decade ago
Thank you friends.
Pritam said:   10 years ago
Could not understand why HCF not LCM?
Suman said:   8 years ago
Thank you all for the given solution.
Sindhuroyal said:   9 years ago
Firstly we have to find two number which is low among three numbers. So we have to take 385,700., in this two numbers 700 is divided by 385.
385)700(1
    385
   _______
   315)385(1
       315
        _____
          70)315(4
             280
            _______
            35)70(2
               70
             _____
               0
The above two numbers is divided till we get remainder is 0. Then last number 35 is need to taken. We have other number which is 1295.
35)1295(37
   105
   _____
    245
    245
   _____
     0 
   _____
So that, 35 is answer guys.
Arun said:   9 years ago
Good explanation, Thank you friends.
Abhishek chaudhary said:   9 years ago
Please tell me one thing. When we have to take LCM and HCF?

I am confused about this.
Aditya (dada) said:   9 years ago
How to decide whether to take hcf or lcm for such sums?
Mounika said:   9 years ago
Thank you for the Excellent explanation @Aparna.
Sakthivel.k said:   9 years ago
Correct explanations thank you all.
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