Answer: The answer is 3:5
Step-by-step explanation:
Find the gcf of both numbers;
21 = 1, 3, 7, 21
35 = 1, 5, 7, 35
Therefore GCF is 7
Divide both by GCF
=
21 ÷ 7 = 3
35 ÷ 7 = 5
Therefore answer is 3:5
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