A student chose a number, multiplied it by 6, then subtracted 138 from the result and got 102. What was the number he chose?  Options:
A) 40
B) 120
C) 130
D) 140
E) 150

Rationale: "solution : let xx be the number he chose , then 6 ⋅ x − 138 = 102 6 x = 240 x = 40 answer a"
Answer: A