Given : three sets of English, Mathematics and science books containing 336,240 and 96 books respectively

Find the HCF of 336,240 and 96 using prime factorization:

\[

\begin{aligned}

&336=2 \times 2 \times 2 \times 2 \times 3 \times 7=2^{4} \times 3 \times 7 \\

&240=2 \times 2 \times 2 \times 2 \times 3 \times 5=2^{4} \times 3 \times 5 \\

&96=2 \times 2 \times 2 \times 2 \times 3=2^{5} \times 3

\end{aligned}

\]

\[

\mathrm{HCF}=2^{4} \times 3=16 \times 3=48

\]

each stack of book will contain 48 books .

Thus, the number of stacks \(=\frac{240}{48}+\frac{336}{48}+\frac{96}{48}=5+7+2=14\)