The HCF and LCM of two numbers are 84 and 21 respectively. If the ratio of the two numbers is 1 : 4 , then the larger of the two numbers is = ?
A. 12
B. 48
C. 84
D. 108
Answer: Option C
Solution(By Examveda Team)
$$\eqalign{ & {\text{Let the numbers be }}x{\text{ and 4}}x \cr & {\text{Then ,}}x \times 4x = 84 \times 21 \cr & \Leftrightarrow {x^2}{\text{ = }}\left( {\frac{{84 \times 21}}{4}} \right) \cr & \Leftrightarrow x{\text{ = 21 }} \cr & {\text{Hence larger number}} \cr & {\text{ = 4}}x \cr & {\text{ = 84}} \cr} $$Related Questions on Problems on H.C.F and L.C.M
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