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Question 12 : The product of two positive numbers is 616. If the ratio of the difference of their cubes to the cube of their difference is 157 : 3, then the sum of the two numbers is

  1. 50
  2. 85
  3. 95
  4. 58

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Explanatory Answer

Let the two numbers be a and b
From the question, we know
a x b = 616
and =
=
=
=
= - 1 =
=
=
= 3 x 3 x 4 = 36
a - b = 6, ab = 616
616 can be rewritten as 22 x 28, where 28 - 22= 6 using trial and error
So, a + b = 28 + 22 = 50


The question is "The product of two positive numbers is 616. If the ratio of the difference of their cubes to the cube of their difference is 157 : 3, then the sum of the two numbers is "

Hence, the answer is 50

Choice A is the correct answer.

 

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