Asign in an elevator says the elevator can lift up to 450 kg. john has 10 boxes that weigh 13.75 kg each, and a number of additional boxes that weigh 15.5 kgs each. if he puts the 10 boxes on the elevator, how many of the additional boxes can be lifted in the same load?

He an put 20 of the additional boxes in the elevator. 10*37.5= 137.5
450-137.5=312.5      312.5/15.5=20.12903226- round down to 20.

Check: 20*15.5=310 & 10*37.5= 137.5 so 137.5+310=447.5- He cannot carry anything else because then it would go over.

So he can put 20 additional boxes+ the original 10 boxes.

(Also you may need to know John's weight- you did not include it. This would affect the number of additional boxes that can be put on.)

Hope this helps!
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