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A. (0,4x300)-75=1/2xn
(120)-75=1/2xn
120-75=1/2xn
45=1/2xn
2x45=n
n=90
B. 24+61:0,5=(42,5:n)x2
24+122=85:2n
146=85:2n
61=2n
n=30.5