Question
At a factory, Henry could assemble 7 aeroplane models in a day while Ken could assemble 3 more aeroplane models than him in a day. If Ken was absent for 5 days, how many days would he need to assemble 21 more aeroplane models than Henry?
3 m

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At a factory, Henry could assemble 7 aeroplane models in a day while Ken could assemble 3 more aeroplane models than him in a day. If Ken was absent for 5 days, how many days would he need to assemble 21 more aeroplane models than Henry?