Mary thought of a positive two-digit number. She multiplied it by 3 and added 11. Then she switched the digits of the result, obtaining a number between 71 and 75, inclusive. What was Mary’s number?
Answer Choices
A. 11
B. 12
C. 13
D. 14
E. 15
Mary thought of a positive two-digit number. She multiplied it by 3 and added 11. Then she switched the digits of the result, obtaining a number between 71 and 75, inclusive. What was Mary’s number?
Answer Choices
A. 11
B. 12
C. 13
D. 14
E. 15