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. 24)
24.
Which of the following fraction is the largest ?
Answer: Option
Explanation:
L.C.M. of 8, 16, 40 and 80 = 80.
| 7 | = | 70 | ; | 13 | = | 65 | ; | 31 | = | 62 |
| 8 | 80 | 16 | 80 | 40 | 80 |
| Since, | 70 | > | 65 | > | 63 | > | 62 | , so | 7 | > | 13 | > | 63 | > | 31 |
| 80 | 80 | 80 | 80 | 8 | 16 | 80 | 40 |
| So, | 7 | is the largest. |
| 8 |
Discussion:
49 comments Page 4 of 5.
Praveen said:
1 decade ago
Its right.
Jyoti mehta said:
1 decade ago
Why we multiply 7/8 to 10 ,13/16 to 5 and 31/40 to 2 ?
Power star pawan kalyan said:
1 decade ago
@Jyoti Mehta
We first find the lcm of the given numbers...7/8,13/16,31/40,63/80
then We'll get that value=80
So.. there goes the process and you'll get the above result...;)
We first find the lcm of the given numbers...7/8,13/16,31/40,63/80
then We'll get that value=80
So.. there goes the process and you'll get the above result...;)
Rohit said:
1 decade ago
The enswer explained is corect and a time saver too.
Ashok said:
1 decade ago
This logic is easy to find the answer & time saving too.
Sandeep ch said:
1 decade ago
Please explain clearly.
Folake said:
1 decade ago
Kalyan please explain it very well. I don't really understand that logic.
Amita said:
1 decade ago
(a) 7/8 (b) 13/16 (c) 31/40 (d) 63/80.
First of all I compare b/t a and b with cross multiplication.
7/8, 13/16.
7*16 13*8.
112 >104.
So 7/8>13/16.
Again compare b/t 7/8 and 31/40.
7*40 31*8.
280 > 248, so 7/8>31/40.
Again compare b/t 7/8 and 63/80.
7*80 8*63.
560 > 504, so 7/8>63/80.
So 7/8 is largest.
First of all I compare b/t a and b with cross multiplication.
7/8, 13/16.
7*16 13*8.
112 >104.
So 7/8>13/16.
Again compare b/t 7/8 and 31/40.
7*40 31*8.
280 > 248, so 7/8>31/40.
Again compare b/t 7/8 and 63/80.
7*80 8*63.
560 > 504, so 7/8>63/80.
So 7/8 is largest.
Deepika said:
1 decade ago
@Archana
4,16,40,80
its simple yar first we have to check that 80 have multiples of 4,16,40
like 4*20,16*5,40*2,80*1.
So 80 is the correct lcm value check like this is is the easy way.
4,16,40,80
its simple yar first we have to check that 80 have multiples of 4,16,40
like 4*20,16*5,40*2,80*1.
So 80 is the correct lcm value check like this is is the easy way.
Deepika said:
1 decade ago
Hi Vijaya nice short cut.
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