Solve the compound inequality in statement (1): 22<3x+1<28. Subtract 1 from each part of the inequality: 22−1<3x+1−1<28−1. Divide each part by 3:
21
3
<
3x
3
<
27
3
The result is that x is some number between 7 and 9; thus, statement (1) is not sufficient. Statement (2), together with statement (1), is sufficient, and the answer is conclusively one value - namely, 8 .