Gọi số sách đó là a
We have :
\(\left\{{}\begin{matrix}a⋮16\\a⋮18\\a⋮20\end{matrix}\right.\)
\(\Rightarrow a\in BC\left(16;18;20\right)\)
\(BCNN\left(16;18;20\right)=...\left(self-reliance\right)\)
\(\Rightarrow a\in\left\{.......\right\}\left(self-reliance\right)\)
Mà \(1500< a< 2000\)
\(\Rightarrow a=...\left(self-reliance\right)\)
Vậy số books đó có ... (self - reliance)