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1 3/4=7/4
3/2x+7/4x+2x=1680
6/4x+7/4x+8/4x=1680
21/4x=1680
x=1680*4/21
x=320
3/2*320=480
7/4*320=560
2*320=640
1½x +1¾x+2x=1680
2 14/4x=1680
21/4x=1680
x= 320
320* 1 1/2= 480
320*2= 640
320* 13/4= 560