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13 Jul 2016, 01:52
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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:
25%
(medium)
Question Stats:
75% (01:29) correct
25%
(01:48)
wrong
based on 76
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Arnold and Danny are two twin brothers that are celebrating their birthday. The product of their ages today is smaller by 9 from the product of their ages a year from today. What is their age today?
A. 2.
B. 4.
C. 5.
D. 7.
E. 9.
A. 2.
B. 4.
C. 5.
D. 7.
E. 9.
13 Jul 2016, 02:24
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Let the age be x and after one year the age be x+1.. now as per the given statement :
(X+1)^2 -x^2 = 9
solving we get x=4 hence B
(X+1)^2 -x^2 = 9
solving we get x=4 hence B
13 Jul 2016, 02:46
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Bunuel
Given Arnold and Danny age be X ( as they are twin brothers will have same age ).
Given the product of their ages is smaller by 9 from the product of their ages a year from today.
The product of their ages as of today be \(X^2\).
Since we are dealing with past year, then their age is also increased by 1 year.
\((X + 1)^2\).
Now difference \((X + 1)^2\) - \(X^2\) = 9.
=> 2X + 1 = 9.
=> 2X = 8. => X = 4.
IMO B is correct option.
OA please...will correct if I missed anything.
