I chose a number and divide it by 6. Then I subtracted 15 from the result and got 5. What was the number I chose? Pick:
A) 600  B) 700  C) 120  D) 900  E) none

Rationale: "solution : let xx be the number i chose , then x / 6 â ˆ ’ 15 = 5 x / 6 = 20 x = 120 answer c"
Answer: C