What is the ratio of the average number of catfish to the average number of all fish in the samples?
StartFraction Average number of catfish over average number of fish EndFraction = StartFraction (3 + 5 + 7) divided by 3 over 20 EndFraction
1:7
1:4
2:5
3:4

1:4

Step-by-step explanation:

Let

x ----> average number of catfish

y ---> average number of fish

we know that

simplify

or

x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x

step-by-step explanation:

last month maria hiked the 5-mile mountain trail a number of times and she hiked the 10-mile canal trail several times. let x represent the number of times she hiked the 5-mile trail, and let y represent the number of times she hiked the 10-mile trail. if she hiked a total of 90 miles, which equation can be used to find the number of times maria hiked each trail? x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x