Aptitude - Numbers - Discussion
Discussion Forum : Numbers - General Questions (Q.No. 77)
77.
The sum of the two numbers is 12 and their product is 35. What is the sum of the reciprocals of these numbers ?
Answer: Option
Explanation:
Let the numbers be a and b. Then, a + b = 12 and ab = 35.
 |
a + b | = | 12 |  |
 |
1 | + | 1 |  |
= | 12 |
| ab | 35 | b | a | 35 |
| Sum of reciprocals of given numbers = |
12 |
| 35 |
Discussion:
11 comments Page 1 of 2.
Chandrajit Karmakar said:
2 years ago
Thanks for explaining the answer.
Priyanka said:
4 years ago
Thank you all for explaining.
Harshil said:
5 years ago
Hello all.
1st no.=a.
2nd no.= b.
As said by the question,
we have to add the reciprocals of a and b.
So,
1/a + 1/b.
=a+b/ab.
As said by the question,
a+b=12.
ab=35.
So,
12/35.
1st no.=a.
2nd no.= b.
As said by the question,
we have to add the reciprocals of a and b.
So,
1/a + 1/b.
=a+b/ab.
As said by the question,
a+b=12.
ab=35.
So,
12/35.
(2)
Shiva said:
7 years ago
Yeah, Thanks @Vishal.
Pooja said:
8 years ago
Super thank you @Vishal.
Mr. MP said:
8 years ago
It start from the reciprocal or inverse.
1/X + 1/Y =?
(Y+X)/ XY =? X+Y and XY value is given in the question 12/35.
1/X + 1/Y =?
(Y+X)/ XY =? X+Y and XY value is given in the question 12/35.
Pradeep said:
9 years ago
Yes, @Vishal Kumar answer is right.
Vishal Kumar said:
1 decade ago
Simple guys.
Let one no. be a and the other is b.
So the sum of two number a+b = 12.
And their product is a*b = ab = 35.
Reciprocal of a = 1/a.
Reciprocal of b = b/a.
So if you add them 1/a+1/b = a+b/ab.
Hope you got it.
Let one no. be a and the other is b.
So the sum of two number a+b = 12.
And their product is a*b = ab = 35.
Reciprocal of a = 1/a.
Reciprocal of b = b/a.
So if you add them 1/a+1/b = a+b/ab.
Hope you got it.
Shalini said:
1 decade ago
I need some more expansion. Is any formula applied?
PritikA Sharma said:
1 decade ago
Please let me know how to solve this question?
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