Răspuns :
42 de bile; 18 bile rosii; 15 bile negre
42-(18+15)=42-33=9 bile galbene
a) 15/42=5/14
b) 18·x/100=9
x=900/18
x=50 %
42-(18+15)=42-33=9 bile galbene
a) 15/42=5/14
b) 18·x/100=9
x=900/18
x=50 %
a) [tex]\dfrac{15}{42}[/tex]=[tex]\dfrac{5}{14}[/tex]
b) 42-(18+15)=42-33=9 bile galbene
18·P%=9
18·[tex]\dfrac{P}{100}[/tex]=9
[tex]\dfrac{9P}{50}[/tex]=9
9P=50·9
9P=450=>P=[tex]\dfrac{450}{9}[/tex]=50%