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17 May 2018, 04:58
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
88% (01:03) correct
12%
(01:32)
wrong
based on 86
sessions
History
Date
Time
Result
Not Attempted Yet
If the sum of two numbers is 19 and their product is 88, what is the difference between the numbers?
A) 2
B) 3
C) 4
D) 5
E) 6
A) 2
B) 3
C) 4
D) 5
E) 6
17 May 2018, 11:00
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Bunuel
\(a + b = 19\)
\(ab = 88\)
Or, \(a = 19 - b\)
So, We have : \((19 - b)b = 88\)
Or, \(b^2 - 19b + 88 = 0\)
Or, \(b^2 -11b - 8b + 88 = 0\)
Or, \(b(b - 11) -8(b - 11) = 0\)
So, \(b = 11\) and \(8\)
Thus, difference of the numbers is 3, answer must be (B)
17 May 2018, 15:41
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Abhishek009
I think that this is enough to stop here (19−b)b=88 and pick a number, rather than to solve quadratic equation. One of the aim of this forum is to teach people to use their time effectively.
