The sum of two numbers is 216 and their H.C.F. is 27. The numbers are · ABC26GN0484
Subject: General Aptitude · Chapter: H.C.F. and L.C.M. of Numbers
The sum of two numbers is 216 and their H.C.F. is 27. The numbers are
(a)27, 189
(b)81, 189
(c)108, 108
(d)154, 162
Answer
Answer (as printed): A
Explanation
Let the required numbers be $27 a$ and $27 b$. Then, $27 a+27 b=216 \Rightarrow a+b=8$. Now, co-primes with sum 8 are $(1,7)$ and $(3,5)$. ∴ Required numbers are (27 × 1, 27 × 7) and (27 × 3, $27 \times 5)$ i.e., $(27,189)$ and $(81,135)$. Out of these, the one available in the given alternatives is the pair (27, 189).
Explanation as extracted from the printed page; notation may be imperfect.