Question
At a factory, Japheth could assemble 8 aeroplane models in a day while Riordan could assemble 4 more aeroplane models than him in a day. If Riordan was absent for 4 days, how many days would he need to assemble 21 more aeroplane models than Japheth?
3 m

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At a factory, Japheth could assemble 8 aeroplane models in a day while Riordan could assemble 4 more aeroplane models than him in a day. If Riordan was absent for 4 days, how many days would he need to assemble 21 more aeroplane models than Japheth?