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1,15 * 42 = 48,3
b) 0,8 * x = 46,4
x= 46,4/0,8
x=58
c) 99/120 * 100 % =82,5 %
x - 15 %
100x = 630/ : 100
x = 6.3
42 + 6.3 = 48.3
x - 100 %
46.4 - 80 %
80x = 4640 /: 80
x = 58
120 - 100 %
99 - x
120x = 9900 / : 120
x =82.5