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Select all the pairs of ratios that form a proportion.

A. 1:6, 4:20

B. 7:9, 28:36

C. 14:18, 21:27

D. 30:80, 6:18

1 answer

A. 1:6, 4:20 form a proportion because if we simplify 4:20, we get 1:5 which is the same as 1:6.

B. 7:9, 28:36 form a proportion because if we simplify 28:36, we get 7:9.

C. 14:18, 21:27 form a proportion because if we simplify 14:18, we get 7:9 and if we simplify 21:27, we also get 7:9.

D. 30:80, 6:18 do not form a proportion because if we simplify 30:80, we get 3:8 which is not equivalent to 6:18.
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