Mixing paints

In this activity, I used the given ratios of red and white in different tins of pink to mix into a different shade of pink, each with a different amount of red and white. I multiplied the ratio of the new shade of pink with different numbers until I could use the two given tins of pink to add into the new shade of pink. The second half of the activity was about using two new tins of paint to make different shades of pink. But I couldn't find a simpler way of finding the new shade of pink in the third section and for some reason, I got all of the answers half right.