Liczba 90 jest o 45% mniejsza od liczby x. Zatem: prosze o szybka odp!
Liczba 90 stanowi 55% liczby x
55%x=90
55/100 x =90 |:55/100
x=163,(63)
x-45%x=90
x-0,45x=90
0,55x=90
x=90/0,55
x=90*100/55
x=1800/11
spr.
1800/11-0,45*1800/11=1800/11-810/11=990/11=90
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Liczba 90 stanowi 55% liczby x
55%x=90
55/100 x =90 |:55/100
x=163,(63)
x-45%x=90
x-0,45x=90
0,55x=90
x=90/0,55
x=90*100/55
x=1800/11
spr.
1800/11-0,45*1800/11=1800/11-810/11=990/11=90