## Algebra 1

Mike takes 75 minutes, Joan takes 60 minutes, Kyle takes 80 minutes $x/75 + x/60 + x/80 = 1$ $3600*(x/75 + x/60 + x/80 = 1)$ $3600x/75 + 3600x/60 + 3600x/80 = 3600$ $48x + 60x+45x = 3600$ $153x = 3600$ $153x/153 = 3600/153$ $x = 23.5$