Question

The LCM of$54,90$ and a third number is $1890$ and their HCF is $18$, The third number is

Answer 1

We have to find Third number

$$\begin{gathered} LCM\times HCF=productofthenumbers \\ 1890\times 18=54\times 90\times x \\ x=7 \end{gathered}$$

Third number $=HCF\times x=18\times 7=126$

Hence, $126$ is the third number.