#1 Which pair of ratios form a proportion?
A) 5 : 11 and 6 : 12
B) 7 : 13 and 21 : 39
C) 8 : 14 and 24 : 30
D) 10 : 20 and 20 : 30
#2 Use a common denominator to determine whether the ratios form a proportion.
6 : 15 and 30 : 80
A) Yes. They form a proportion.
B) No. They do not form a proportion.