Question

Purple paint is made by mixing red and blue paint together. Jemma has some purple paint made from 300ml of red paint and 400ml of blue paint. How much red paint does Jemma need to add to make the ratio red to blue 2:1.

A. 200ml
B. 300ml
C. 400ml
D. 500ml

Answer 1

To achieve a 2:1 ratio of red to blue paint with 400 ml of blue, Jemma needs a total of 800 ml of red paint. Currently having 300 ml of red, she must add 500 ml more, making the answer 500 ml (Option D).

Step-by-step explanation:

Jemma has purple paint made from 300ml of red paint and 400ml of blue paint and wants to change the ratio of red to blue to 2:1. To find out how much red paint Jemma needs to add, we can set up a proportion. Since the ratio must be 2 parts red to 1 part blue, for every 2 ml of red paint, there should be 1 ml of blue paint. Jemma currently has 400 ml of blue paint, so she would need 800 ml of red paint in total to achieve the 2:1 ratio.

Currently, Jemma has 300 ml of red paint, so she needs to add an additional 500 ml to reach 800 ml (since 800 - 300 = 500). Therefore, the answer to how much red paint Jemma needs to add to achieve a 2:1 red to blue ratio is 500 ml (Option D).