Question
At a factory, George could assemble 7 aeroplane models in a day while Billy could assemble 5 more aeroplane models than him in a day. If Billy was absent for 2 days, how many days would he need to assemble 20 more aeroplane models than George?
3 m

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At a factory, George could assemble 7 aeroplane models in a day while Billy could assemble 5 more aeroplane models than him in a day. If Billy was absent for 2 days, how many days would he need to assemble 20 more aeroplane models than George?