Question
At a factory, Zeph could assemble 9 aeroplane models in a day while Andy could assemble 4 more aeroplane models than him in a day. If Andy was absent for 3 days, how many days would he need to assemble 16 more aeroplane models than Zeph?
3 m

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At a factory, Zeph could assemble 9 aeroplane models in a day while Andy could assemble 4 more aeroplane models than him in a day. If Andy was absent for 3 days, how many days would he need to assemble 16 more aeroplane models than Zeph?