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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 3 of 5.
Manasbh said:   8 years ago
Thanks a lot.
Vrinda said:   8 years ago
Why should we add not multiply?
NKC said:   8 years ago
In this question, we need a length that can measure all the lenths but the length of the required scale is shortest that can esasily multiples of the given lengths.
Vipin said:   10 years ago
Why 85 cm is considering to find HCF?
Raviteja said:   1 decade ago
Required length = H.C.F. of 700 cm, 385 cm and 1295 cm.
385)700(1
    385
    ---
    315)385(1
        315
        ---
        70)315(4
           280
           ---
           35)70(2
              70
              --
               x

35)1295(37
   1295
   ----
    X
   ----
i.e., H.C.F. of 700 cm, 385 cm and 1295 cm = 35 cm.
111 said:   1 decade ago
Thanks Ravireja
111 said:   1 decade ago
Thanks raviteja
Nikhil said:   1 decade ago
Why it is HCF? why not LCM?

Please explain.
145 said:   1 decade ago
As we need to find out greatest possible length as mentioned in the queue. We need to find out HCF and not LCM.
146 said:   1 decade ago
Please give me the prime factors of 1295.
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