Question

Pomożcie...wystarczy tylko wyniki xd

Answer 1

1) 10% - 2kg*100%+18kg*0%=20kg * x% I 200kg*%=20kg*x% /:20kg  x = 10%
2) 15g - 100%*x + 0%(500g-x) = 3% * 500g I 100%*xg = 1500g*% /:100% x = 15g
3) 4% - 400g * 5% + 100g * 0% = 500g*x I 2000g*% = 500g*x /:500g x=4%
4) 30g - 200g * 8% + xg * 100% = 20%(200+x) I 1600g*% + 100xg*% = 4000% + 20%x I 80x = 2400g /:80 x = 30g 
5) 200g - 300g * 2% - xg * 0% = 6%(300-x) I 600g*% = 1800% - 6xg*% I -1200g*% = -6xg*% /:(-6%) x=200g 
6) 100g - 500g * 6% + xg * 0% = 5%(500+x) I 3000g*% = 2500g*% + 5xg*% I 500g*% = 5xg*% /:5% x = 100g
7) 3,8% - 200g * 3% + 800g * 4% = 1000g*x*% I 600g*% + 3200g*% = 1000g*x*% I 3800g*% = 1000g*x*% /:1000g   x = 3,8%