Answer:
(a) 25%
(b) 3:1
Step-by-step explanation:
A shade of orange paint is made with 5 parts red paint and 15 parts yellow paint.
(a)
Total parts used in making orange paint=(5+15)+20 parts.
Number of parts of red paint used=5
Percent of paint is red= [tex]\dfrac{Number of parts of red paint used}{Total number of parts used}\times100[/tex]
=[tex]\dfrac{5}{20}\times100[/tex]
=25%
Hence 25% of red paint was used to make orange paint.
(b)
The simplified ratio of yellow to red paint is: [tex]\dfrac{15}{5}=\dfrac{3}{1}[/tex]
Hence, the ratio is: 3:1.
