Answer:
4 would be the answer hopefully
Notice this is a geometric progression since each number multiplied by some factor equals the next number in the sequence, in this case,

Then by applying the formula for sum to infinity of a geometric progression,
I'm not to sure maybe b ?
40% water 60% milk
reason:
if you make then go to 100 by multiplying 2:3 by 2 you get 4:6 and then add a 0 at the end and there’s your answer
B and c are correct because you use divison and multiplication to get the right answer and the right answer is 99cm