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1. a) 73,5g/350g |:3,5 21g/100g b) 126g/350g |:3,5 36g/100g c) 0,56g?350g |;3,5 0,016g/100g 2. a) 37g - 100g x - 250g x = 37g * 250g /100g = 92,5g b) 300g - 100g x - 250g x= 300g*250g / 100g = 750g c) 7,7g - 100g x - 250g x = 7,7g* 250g / 100g =19,25g 13. d=1kg/dm³ v= 0,25dm³ m=d*v m=0,25kg=250g 36g - 100g x - 250g x=36g*250g / 100g = 90g odp : 90g 12. 75g - 100g x - 500g x= 75*500g / 100g = 375g odp : 375g 16. a) Mr = 250g Cp = 10% Cp = ms * 100% / mr ms = Cp * mr / 100% ms = 10% * 250g / 100% = 25g 250g - 25g = 225g odp : 225g b) mr =200g Cp=15% ms=Cp * mr / 100% ms = 15% * 200g / 100% = 15g 200g - 15g = 185g odp: 185g 17. a) ms= 20g Cp = 5% Cp= ms * 100% / mr mr = ms * 100% / Cp mr = 20g * 100% / 5% = 400g 400g - 20g = 380g odp : 380g b)ms=75g Cp=15% mr=ms*100% / Cp mr = 75g * 100% / 15% = 500g 500g - 75g = 425g odp : 425g 18. mr = 150g Cp = 10% ms = Cp * mr / 100% ms = 10% * 150g / 100% ms =15g 150g - 15g = 135g odp:135g