Question

1.Woda morska zawiera 5% soli. Z ilu kilogramów tej wody otrzymamy 20 kg soli?

2.Oblicz jakim procentem wielkości w jest a ,jeżeli :

a) w=3 godz , a=20min

b)w=11h , a=1h 6min

c)w=42 zł , a=2 zł 10gr

d)w=2,2 km , a=1210m

e) w=24cm , a= 0,6m

pełne zadania poproszę;)

Answer 1

 

 

 

Zad.2

a)w=3h=180min

a=20min

20/180*100%=11,11%

b)w=11h=660min

a=1h 6min=66min

66/660*100%=10%

c)w=42zł=4200gr

a=2zł 10gr=210gr

210/4200*100%=5%

d)w=2,2km=2200m

a=1210m

1210/2200*100%=55%

e)w=24cm

a=0,6m=60cm

60/24*100%=250%

Answer 2

1. 20kg soli = 5%

x kg wody = 100%

x=20kg*100%/5%=400kg

 

2.

a) w=3godz.=180min

100%=180min

x%=20min

x%=100%*20min/180min=11,(1)%

 

b)w=11h=660min  a=1h 6min=66min

100%=660min

x%=66min

x%=100%*66min/660=10%

 

c)w=42zł=4200gr  a=2zł10gr=210gr

100%=4200gr

x%=210gr

x%=100%*210gr/4200gr=5%

 

d)w=2,2km=2200m

100%=2200m

x%=1210m

x%=100%*1210m/2200m=55%

 

e)a=0,6m=60cm

100%=24cm

x%=60cm

x%=100%*60cm/24cm=250%