Question
At a factory, Ryan could assemble 9 aeroplane models in a day while Jack could assemble 3 more aeroplane models than him in a day. If Jack was absent for 5 days, how many days would he need to assemble 20 more aeroplane models than Ryan?
3 m

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At a factory, Ryan could assemble 9 aeroplane models in a day while Jack could assemble 3 more aeroplane models than him in a day. If Jack was absent for 5 days, how many days would he need to assemble 20 more aeroplane models than Ryan?