There are 12 rabbits in a cage. The ratio of white rabbits to all rabbits is 3:4. How many rabbits are in the cage?

12 rabbits

white to all=3 to 4

that means that there are 3 white units and 4 all units

so if 12=all then

12=4 units

divide by 4

3=1 unit

if whit=3 units then

3=1 unit

3 times 3=9=3 units

9 white rabbits

and 3 non white rabits

Set up a proportion:

3/4 = x/12

Cross multiply:

36 = 4x

Divide 4 to both sides:

x = 9