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b)(3/4+6 4/10:8/15)*8/10=(3/4
+ 64/10*15/8)*8/10=(3/4+24/2)*8/10=(3/4+48/4)*8/10=51/4*
8/10=51/20=2 11/20
c)3/2*(3/6+4 1/5):2/5=3/2*(15/30+4 6/30):2/5=3/2*4 21/30:2/5=3/2*141/30:2/5=
141/20:2/5=141/20*5/2=141/8=17 5/8
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