Please check the questions/problems along with my answers. Thank you tutors.

Writing Ratios

1. Top-of-the-line monster masks are made of rubbery silicone, using a liquid silicone base and a catalyst (substance that speeds up a chemical reaction) in a ratio of 1 to 1. What is the ratio of catalyst to total ingredients?
My answer: 1:2, 1 to 2, or 1/2

2. You want to make a bright-red silicone mask. For every 100 grams of silicone mix, you need to add 5 grams of red coloring.
2A. What is the ratio of total ingredients to coloring in simplest terms?
My answer: 105 to 5
2B. If you start with 150 grams of silicone mix, how many grams of coloring will you need?
My answer: 7.5 g