Question
At a factory, Eric could assemble 7 robots in a day while Lee could assemble 4 more robots than him in a day. If Lee was absent for 4 days, how many days would he need to assemble 21 more robots than Eric?
3 m

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At a factory, Eric could assemble 7 robots in a day while Lee could assemble 4 more robots than him in a day. If Lee was absent for 4 days, how many days would he need to assemble 21 more robots than Eric?