Question
At a factory, Carl could assemble 9 toy helicopters in a day while Charlie could assemble 4 more toy helicopters than him in a day. If Charlie was absent for 3 days, how many days would he need to assemble 12 more toy helicopters than Carl?
3 m

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At a factory, Carl could assemble 9 toy helicopters in a day while Charlie could assemble 4 more toy helicopters than him in a day. If Charlie was absent for 3 days, how many days would he need to assemble 12 more toy helicopters than Carl?