Question

Twice a number (x) is less than 18

Answer 1

2x<18
=x<9

because twice a number x is x multiplied by two, which can also be written as 2x. and if its less than 18, you use the sign "<", so the inequality is 2x<18, and the solution is x<9

Answer 2

2x < 18.
The solution to the inequality would then be x < 9.