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3 1/4=(3*4+1)/4=13/4
2 5/8=(2*8+5)=21/8
18/5+13/4+21/8=(8(13)+10(13)+5(21))/40=(104+130+105)/40=339/40= 8 19/40
24 + 10 + 25
2 3/5 + 3 1/4 + 2 5/8 = --------------------------- = 59/40 = 8 19/40
40
104+130+105
2 3/5 + 3 1/4 + 2 5/8= 13/5 + 13/4 + 21/8= ------------------- =339/40=8 19/4
40