A student chose a number, multiplied it by 3, then subtracted 138 from the result and got 102. What was the number he chose? Choose the correct choice from the following options: A) 80 B) 120 C) 130 D) 140 E) 150

Rationale: "solution : let xx be the number he chose , then 3 ⋅ x − 138 = 102 3 x = 240 x = 80 answer a"
Answer: A