Q. दो संख्याओं के लघुत्तम समापवर्त्य (LCM) और महत्तम समापवर्तक (HCF) के योग तथा अंतर क्रमश: 369 और 351 है। यदि एक संख्या 72 है, तो दूसरी संख्या ज्ञात कीजिए।
The sum and difference of the least common multiple (LCM) and greatest common factor (HCF) of two numbers are 369 and 351 respectively.If one number is 72,find the other number. [RRB NTPC CBT-1 CEN.NO.1/2019]
A)45 B)75 C)90 D)85
Solution :-
Formula Use
LCM x HCF = A1 x A1 where A1 & A2 two Numbers.
Given in Ques,
A1 =72, A2 = ?
LCM + HCF = 369 equ..(i)
LCM - HCF = 351 equ..(iI)
Now equ..(ii) Subtract from Equation (i)
we get 2 HCF = 18
Or HCF = 9
HCF Value Put in Equation (i)
we get LCM + 9 = 369
or LCM = 369 -9 = 360
Now,
LCM x HCF = A1 x A1 where A1 & A2 two Numbers.
360 x 9 = 72 x A2
A2 = (360 x 9) / 72
A2 = 3240 / 72 = 45 Answer
The other number is 45.
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