Let the number which when multiplied by 13 is increased by 180.
Choose the correct choice:  A) 14  B) 20  C) 15  D) 28  E) 30

Rationale: "solution let the number be x . then , 13 x - x = 180 ‹ = › 12 x = 180 x ‹ = › 15 . answer c"
Answer: C