Question

PLEASE HELP!!!!

Answer 1

First thing you need to do is find the area of each colored domain. Then you have to figure out the ratio of each ring's area to the total target's area.

Assigning W=white area, R=red area,B=blue area,Y=yellow area, and T for the entire target face area

W = pi*1^2
R = pi*3^2 -W
B = pi*5^2 -R -W
Y = pi*7^2 -B -R -W
T = pi*7^2

For #21, the probability is
W:T

For #22, the probability is
B:T

For #23, the probability is
(B+R):T

Freebie: The answer to #24 is 1:1, or 100%