pLzHaLpMe pLzHaLpMe 28-01-2015 Mathematics Answered Which pair of ratios form a proportion? A. 2 : 3 and 3 : 4 B. 8 : 12 and 16 : 20 C. 4 : 7 and 12 : 21 D. 9 : 15 and 10 : 16