Question
At a factory, Pierre could assemble 6 aeroplane models in a day while Zane could assemble 4 more aeroplane models than him in a day. If Zane was absent for 4 days, how many days would he need to assemble 21 more aeroplane models than Pierre?
3 m

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At a factory, Pierre could assemble 6 aeroplane models in a day while Zane could assemble 4 more aeroplane models than him in a day. If Zane was absent for 4 days, how many days would he need to assemble 21 more aeroplane models than Pierre?