Final answer:
By setting up an equivalent fraction and cross-multiplying, it was determined that 84 percent of the students ate cereal.84 percent of students ate cereal, calculated by setting up the equivalent fraction (21/25) = (x/100) and solving for x.
Step-by-step explanation:
To calculate the percentage of students that ate cereal, you would set up an equivalent fraction with 100 as the denominator and then cross-multiply to solve for the percentage.
In this case, if 21 out of 25 students ate cereal, you would have the fraction 21/25. To find the percentage, you would set up the following equation: (21/25) = (x/100), where x represents the percentage of students that ate cereal.
To solve for x, you would cross-multiply to get 25x = 2100. Next, you divide both sides by 25 to isolate x, getting x = 84. Therefore, 84 percent of the students ate cereal.
To determine the percentage of students who ate cereal, set up an equation with the fraction 21/25 and the unknown percentage x/100. By cross-multiplying, you obtain 25x = 2100. Dividing both sides by 25 yields x = 84. Therefore, 84% of the students ate cereal.