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2 . 68/10-1/20-1/4 = 136/20-1/20-5/20= 130/20
2) 68/10 - 1/20 - 1/4 = 136/20 - 1/20 - 5/20 = 130/20 = 13/2
3) 19/5 - 25/100 - 2/20 = 19/5 - 1/4 - 1/10
= 76/20 - 5/20 - 2/20
= 69/20
4) 51/10 - 7/5 - 2/3 = 153/30 - 42/30 - 20/30 = 91/30