Part A. The answer is ''There is more yellow than green'' - For this, you had to change 2/6 into a fraction with a denominator of 12, so you do how much times 6 can go into 2, and multiply that with the numerator and you get 4/12. Now you just compare the numerators.
Part B. Andrea is correct because 1/2 of the bucket is 6/12, and there is 5/12 blue, so it is less