Question
At a factory, Lee could assemble 9 toy helicopters in a day while Tom could assemble 5 more toy helicopters than him in a day. If Tom was absent for 4 days, how many days would he need to assemble 21 more toy helicopters than Lee?
3 m

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At a factory, Lee could assemble 9 toy helicopters in a day while Tom could assemble 5 more toy helicopters than him in a day. If Tom was absent for 4 days, how many days would he need to assemble 21 more toy helicopters than Lee?