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40%=20
100%=x
40x=2000 | :40
x = 50
c)
30% = 24
100% = x
30x = 2400 | :30
x = 80
d)
20% = 3
100 % = x
20x = 300 |:20
x = 15
e)
80 % = 32
100% = x
80x = 3200 |:80
x = 40
f)
70% = 140
100% = x
70x = 14000 |:70
x= 200
g)
90%= 27
100% = x
90x = 2700 |:90
x = 30
h)
15% = 24
100% = x
15x = 2400 |:15
x = 160