A) \[15\le 2t+1\le 20\]
B) \[8\le t<12\]
C) \[8\le t+1\le 13\]
D) \[21\le 3t\le 24\]
E) \[t\le 7\]or\[t\ge 12\]
Correct Answer: C
Solution :
We have \[3\le 3t-18\le 18\] \[\Rightarrow \] \[3+18\le 3t\le 18+18\] \[\Rightarrow \] \[21\le 3t\le 36\] \[\Rightarrow \] \[7\le t\le 12\] \[\Rightarrow \] \[8\le t+1\le 13\]
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