Respuesta :

Answer:

21 > 3x ≥ 12

Step-by-step explanation:

Let's represent "a number" with the variable x.

Keep in mind: times means multiplication. *

21 > 3x ≥ 12

The part on the left shows us that the 3x is less than 21. The part on the right shows that it's greater than or equal to 12.