Answer: Lisa should mix 4.5 units of red paint with 12 u its of white paint.
Step-by-step explanation:
Lisa mixes 3 units of red paint with 8 units of white paint to get pink. This means that the ratio of red paint to white paint is 3/8.
Let x represent the number of units of red paint that she should mix with 12 units of white paint to get the same pink shade. Therefore
3/8 = x/12
Cross multiplying, it becomes
8 × x = 3 × 12
8x = 36
x = 36/8 = 4.5
