I chose a number and divide it by 9. Then I subtracted 100 from the result and got 10. What was the number I chose? Pick one
A) 600 B) 700 C) 990 D) 900 E) none

Rationale: "solution : let x be the number i chose , then x / 9 â ˆ ’ 100 = 10 x / 9 = 110 x = 990 answer c"
Answer: C