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100 % - x l
0,9x = 150 / :0,9
x = 166,(6)
90% - 150l
x=(w przybliżeniu) 166,7l
150l - 90%
x l - 100%
i mnożysz na ukrzyż
90*x=150*100
90x=15000 //:90
x≈166,67