4800 persons run a marathon, 1200 reach the finish line. What is the percent of people reach the finish line at the marathon?

25%

Step-by-step explanation: So first make the number of people who ran the marathon and the number of people who finished the marathon into a ratio

1200:4800

then make that into a fraction, 1200/4800

then make the percent of people who reached the marathon into a fraction, using 100 as the denominator and a variable as the numerator.

for example. p/100 (p, represents the percent)

then cross multiply.

1200x100=1200000

Last divide 1200000 by 4800 to get 25%.

Number of green fish = 6

Step-by-step explanation:

Let x be the number of green fish in the aquarium.

Given:

        then there are (x+3) yellow fishes in the aquarium.

        Total number of fish = x+(x+3) = 2x+3

Hence:

the number of green fish = 6

the number of yellow fish = 6+3 = 9