c. 11
it's c because if they start with 5 then
1=5
2=6
3=7
4=8
5=9
6=10
7=11
3/6 divide numerator and denominator by 3 and get 1/2
12/20 divide the numerator and denominator by 2 ,and get 6/10 divide by 2,and get a final answer of 3/5.
8/24 divide the numerator and denominator by 8 ,and get 1/3.
30/40 divide the numerator and denominator by 10 ,and get 3/4
I hope this helps you,and good luck.
As we know
area of triangle = 1/2 *height*base
32=1/2*8*base
32=4*base
8 =base