Question
At a factory, Daniel could assemble 6 aeroplane models in a day while Mark could assemble 3 more aeroplane models than him in a day. If Mark was absent for 3 days, how many days would he need to assemble 20 more aeroplane models than Daniel?
3 m

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At a factory, Daniel could assemble 6 aeroplane models in a day while Mark could assemble 3 more aeroplane models than him in a day. If Mark was absent for 3 days, how many days would he need to assemble 20 more aeroplane models than Daniel?