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2,25x = 45
x = 45 : 2,25
x = 40
jadi bilangan 20 dan 25
a= 125% b
45= 125% b +b
45= 125*b/100 +100b/100
45= 125*b+100b/100
45= 225 b
45*100= 225b
4500/225 = b
20 = b
a= 125% b
a= 125%*20
a= 25