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178 : 0,20 = 890
b)45%stanowi liczba 33,75
33,75 : 0,45 = 75
c)63%stanowi liczba 75,6
75,6 : 0,63 = 120
d)87%stanowi liczba 304,5
304,5 : 0,87 = 350
100%-x
x=178*100% /20%
x=890
b)45%-33,75
100%-x
x=33,75*100%/45%
x=75
c)63%-75,6
100%-x
x=75,6*100% /63%
x=120
d)87%-304,50
100%-x
x=304,50*100%/87%
x=350