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45-x
80x=4500
x=56,25%
b) 16-100%
3-x
16x=300
x=18,75%
c) 3,5-100%
2,8-x
3,5x=280
x=80%
d) 1/2-100%
9/20-x
0,5-100%
0,45-x
0,5x=45
x=90%