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. 30)
30.
If the sum of two numbers is 55 and the H.C.F. and L.C.M. of these numbers are 5 and 120 respectively, then the sum of the reciprocals of the numbers is equal to:
Answer: Option
Explanation:
Let the numbers be a and b.
Then, a + b = 55 and ab = 5 x 120 = 600.
 The required sum = |
1 | + | 1 | = | a + b | = | 55 | = | 11 |
| a | b | ab | 600 | 120 |
Discussion:
37 comments Page 4 of 4.
Ankur said:
9 years ago
Guys! LCM * HFC = PRODUCT OF TWO NUMBERS. This is the rule.
(1)
Sonu said:
9 years ago
How can we solve this? Let me know the method of solution.
Maha said:
4 years ago
@Balamurugan.
By Cross multiply, you well get this.
By Cross multiply, you well get this.
Raj said:
1 decade ago
How to find those two numbers?
Balamurugan said:
4 years ago
1/a+1/b=a+b/ab. How is come??
Abhishek said:
10 years ago
Thanks it helped me a lot.
Amol said:
1 decade ago
Why 1/a + 1/b ?
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