Question

A certain shade of pink is created by adding 3 cups of white paint to 2 cups of

red paint. If 7 cups of white paint is used, how many cups of red paint is needed?

Answer 1

Greetings from Brasil...

Let's apply rule of 3....

WP RP

3 -------- 2

7 -------- X

3 · X = 7 · 2

3X = 14

X = 14/3

remember that

14/3 = 4 2/3

So, 7 WP = 4 2/3 RP

................................................

D | d

R Q

so

D/d = Q R/d

Answer 2

10 1/2

Explanation:

white : red

2 : 3

1 : 3/ 2

7 : 3/2 ×7

7 : 10.5

7 : 10 1/2

option 3 is the answer