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a) 1,10 *x= 55
x=55:1,10
x=50
b)100%-15%=85%=0,85
0,85*x=170
x=170:0,85
x=200
2)100%-92%=8%=0,08
0,08*x=1
x=1:0,08
x=12,5 prawdziwka
3) 100%+12,5%=112,5%=1,125
1,125*x=45
x=45:1,125
x=40min