Given 105, 28 and 63, we want to find the Lowest Common Multiple (LCM)
We have the numbers written as product of prime factors as follows:
[tex]\begin{gathered} 105=3\times5\times7 \\ 28=2^2\times7 \\ 63=3^2\times7 \end{gathered}[/tex]The LCM is now:
[tex]7\times3^2\times5\times2^2=1260[/tex]