The difference between two positive integers is 3. If the sum of their squares is 369, then the sum of the… · ABC26GN1709

Subject: General Aptitude · Chapter: Problems on Numbers · Exam: S.S.C. 2003

The difference between two positive integers is 3. If the sum of their squares is 369, then the sum of the numbers is
(a)25
(b)27
(c)33
(d)81
Answer
Answer (as printed): B
Explanation
Let the numbers be x and (x + 3). Then, x2 + (x + 3)2 = 369 ⇔ x2 + x2 + 9 + 6x = 369 ⇔ 2x2 + 6x – 360 = 0 ⇔ x2 + 3x – 180 = 0 ⇔ (x + 15) (x – 12) = 0 ⇔ x = 12. So, the numbers are 12 and 15. \ Required sum = (12 + 15) = 27.

Explanation as extracted from the printed page; notation may be imperfect.

Study loop for Problems on Numbers

1. Practise the PYQsPrevious-year questions, with answers

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