It is: 15
The halfway number between 3 and 6 is 4.5.
Then number half way between them is their mean average: (-3/7 + -15/14) ÷ 2 = (-6/14 + -15/14) ÷ 2 = -21/14 ÷ 2= -21/28 = -3/4
3
3/4
It is: 15
12
The halfway number between 3 and 6 is 4.5.
The halfway number between 3/4 and 3/5 is 27/40.
12
Then number half way between them is their mean average: (-3/7 + -15/14) ÷ 2 = (-6/14 + -15/14) ÷ 2 = -21/14 ÷ 2= -21/28 = -3/4
2.8
4.35
3
0.5
It's 2.
1