Which pairs of ratios form a proportion? Choose all that apply.
A. one over six and four over twenty
B. seven over nine and twenty-eight over thirty-six
C. fourteen over eighteen and twenty-one over twenty-seven
D. thirty over eighty and six over eighteen
A. one over six and four over twenty (Yes, both reduce to 1/6 and 1/5 respectively, so they are equivalent)
B. seven over nine and twenty-eight over thirty-six (Yes, both reduce to 7/9 and 7/9 respectively, so they are equivalent)
C. fourteen over eighteen and twenty-one over twenty-seven (No, they do not reduce to the same ratio)
D. thirty over eighty and six over eighteen (No, they do not reduce to the same ratio)
The answer is A and B.