d-Denis
e-Earl
d+e=42
e+8=d
e+8+e=42
2e+8=42
2e=34
e=17
d=17+8=25
Denis is 25 and Earl is 17
The chart is how the separate sections of 81 dogs.
For Labrador Retrievers, we need 2/9 of 81.

Divide 9

18 is the final answer
Two square roots that are used to estimate the square root of 8 is 4 and 2