3600 t are sent to the plant. coal in cars, on 60 t in everyone, and as much coal in cars, on 90 t. in everyone. What cars it was required more and on how many more? tell conditions please

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1) 3600:60=60 (c) - on 60 t 2)3600:90=40 will be required (c) - on 90 t Answer will need 3)60-40=20 (c): on 20 cars on 60 t it will be required more, than cars on 90 t.
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Answer add