Coach Brown wants to separate the 20 boys and 30 girls in his PE class equally. What is the greatest number of groups he can create, where each group will have the same number of boys and girls in each group? A. 2
B. 5
C.10
D. 15

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional

but which class are u may know that first

18.8cm hope i at all

step-by-step explanation: