Answer:
8 centimeters.
Step-by-step explanation:

Divide 3 both sides:

Multiply 4 on both sides:

8cm on the map represents 20km.
If your asking for a standard deck of cards the probability is 1/8
The number of people increased by 2.
This means as a ratio it is now 6/4 as many as originally planned.
6/4 can be reduced to 3/2.
The time and the number of people are inversely proportional, so the food would last 2/3 ( inverse is flipping the original ratio over) the original length of time.
This means the length of time the food lasts is reduced by 1/3, which is 33.3%
36 and 12
36+12=48 and 36-12=24
5.14- 3.89 = 1.25 1.25/ 0.25 =5 m=5 I think, you might want to check it :)