A 10 seconds question!

Algebra Level 2

\[\large {\color{brown}\log_{\color{teal}4} \color{blue}9 \color{orange}\times \color{brown}\log_{\color{blue}{81}} \color{#ff00cc}5 \color{orange}\times \color{brown}\log_{\color{red}7} \color{teal}{16} \color{orange}\times \color{brown}\log_{\color{#ff00cc}{25}} {\color{red}{49}} }\]