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A store recived a delivery that consists of x boxes that weight 30 pounds each and y boxes that weight 20 pounds each. There are 64 total boxes in the delivery and they have combined weight of 1400 pounds .

Enter the number of boxes in the delivery that weight 20 pounds.

______boxes

Respuesta :

let no of x box=q

let no of y box=p

30q+20p=1400

3q+2p=140

2q+2p+p=140

128+q=140(q+p=128)

q=12

p=52