If there is a 1.3 ratio of river to ocean dragons, and there are 12 ocean dragons, how many river dragons will you have

4 river dragons

Step-by-step explanation:

1 : 3 = x : 12

(1 x 4) : (3 x 4) = x : 12

4 : 12 = x : 12

x =  4

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.