The lcm of 6,5,and 3 is 30.
10,000,000+
8,000,000+800,000+1,000+300+10
10 pennies, 16 dimes, 19 nickles.
Sorry I'm not from US so I don't know your currency. Sorry about that. Hope what I have given you is enough. :)
Divide the number of decorations made in 3 and a half hours by 3.5.
280/3.5= 80
They can make 80 decorations per hour
Hope this helps!