Answer:
Both
Step-by-step explanation:
21:3 can also be written as [tex]\frac{21}{3}\\[/tex] or 21 ÷ 3
21 ÷ 3 = 7,
so this is correct.
21:7 can also be written as [tex]\frac{21}{7}[/tex] or 21 ÷ 7
21 ÷ 7 = 3,
so this is also correct.
The two options are correct, even if they have different results, the two divisions are fine
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