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= 4/3*5/2*4
= 10/3*4
= 40/3
= 13 1/3 (B)
7. 0,5+1/4+1,5 = 1/2+1/4+15/10
= 1/2+1/4+3/2
= 9/4
= 2 1/4 kg (B)