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.

Sakthivel.k said: 9 years ago

Correct explanations thank you all.

Prasad.p said: 9 years ago

Thanks for solving this sum. It is very helpful to me.

Dilbag said: 8 years ago

Superb explanations. Thank you all.

Suman said: 8 years ago

Thank you all for the given solution.

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.

Vrinda said: 8 years ago

Why should we add not multiply?

Manasbh said: 8 years ago

Thanks a lot.

Archit said: 8 years ago

It is very simple.

Just check the options , if any option is not divisible by any length then you can rule out that option.

Suppose 15 =3*5 where 3 is not divisible by 700 so it's not the right option.
Now 25 is not divisible by 385 so it is also ruled out,
Now 35 =7*5 which can be divided by all,
And last 42 (is even will give even multiple) which is also not divisible by 385 and you don't even have to check for the last one.

(4)

Bunny said: 8 years ago

How to find factors? Someone explain me.

Abhishek said: 7 years ago

Thanks all for explaining the answer.

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