Problem: a student chose a number , multiplied it by 2 , then subtracted 138 from the result and got 108 . what was the number he chose ?
Rationale: "let xx be the number he chose , then 2 â ‹ … x â ˆ ’ 138 = 108 x = 123 answer : a"
annotated_formula: divide(add(108, 138), 2)