Question
At a factory, Mark could assemble 9 toy helicopters in a day while Albert could assemble 4 more toy helicopters than him in a day. If Albert was absent for 4 days, how many days would he need to assemble 19 more toy helicopters than Mark?
3 m

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At a factory, Mark could assemble 9 toy helicopters in a day while Albert could assemble 4 more toy helicopters than him in a day. If Albert was absent for 4 days, how many days would he need to assemble 19 more toy helicopters than Mark?