Question
At a factory, Michael could assemble 7 aeroplane models in a day while Ivan could assemble 3 more aeroplane models than him in a day. If Ivan was absent for 4 days, how many days would he need to assemble 12 more aeroplane models than Michael?
3 m

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At a factory, Michael could assemble 7 aeroplane models in a day while Ivan could assemble 3 more aeroplane models than him in a day. If Ivan was absent for 4 days, how many days would he need to assemble 12 more aeroplane models than Michael?