Final answer:
The inequality that represents the description 'Twice a number (x) is less than 10' is 2x < 10. The solution to the inequality is x < 5.
Step-by-step explanation:
The inequality that represents the description 'Twice a number (x) is less than 10' is: 2x < 10. To solve this inequality, we need to isolate x.
Divide both sides of the inequality by 2: x < 5
Therefore, the solution to the inequality is x < 5.