Problem: a student chose a number , multiplied it by 3 , then subtracted 138 from the result and got 102 . what was the number he chose ?
Rationale: "solution : let xx be the number he chose , then 3 ⋅ x − 138 = 102 3 x = 240 x = 80 answer a"
annotated_formula: divide(add(102, 138), 3)