7. Xiao Ming and Xiao Hua are counting the picture cards in a box together. Xiao Ming is faster, and in the time it takes him to count 6 cards, Xiao Hua can only count 4. When Xiao Hua counted to 48 cards, he forgot the number and had to start over. When he counted to 112 cards, there was only 1 card left in the box. The box originally had ( ) picture cards.
【Answer】353
【Analysis】Exam Point: Ratio Application Problem
\begin{tabular}{lc} 
Xiaoming & Xiaohua \\
6 & 4 \\
12 & 8 \\
8 & 12 \\
$\ldots \ldots$. & $\ldots \ldots$ \\
72 & 48 \\
6 & 4 \\
12 & 8 \\
18 & 12 \\
$\ldots \ldots$. & $\ldots \ldots$ \\
168 & 112 \\
Total $72+112+168+1=353$ cards
\end{tabular}