The # halfway in between 21 and 63 is 42.
Answer:
the ratio of make to female teachers is 3:7
Answer: 31/35
Step-by-step explanation:
There's 9 choices for the first digit and 4 choices for the last digit. The number of choices for the 2nd and 3rd digits is 90 if 2 numbers are different. or 100 if duplicates are allowed.
If duplicates are allowed the answer is 9 * 100 * 4 = 3600 possible numbers.
