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= 15/3 = 5
5+5+5 = 15
b) 1/12 + 1/6 + 1/4 = 1/12+2/12/+3/1 = 6/12
= 12/6 = 2
4+4+2 = 10
1/15+1/10 = 2/30+3/30 = 5/30
= 30/5 = 6
c) 5+15+10+10 = 40
40+20 = 60
15+15 = 30
1/60+1/30 = 1/60+2/60 = 3/60
= 60/3 = 20