" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
20-x - ilosc zlych odp.
5x-7(20-x)=52
5x-140+7x=52
12x=52+140
12x=192 /:12
x=16
20-16=4
Odp. Ilosc odp. dobrych 16, zlych 4.