28 students in the class 75% pass how many students pass

21 students pass

Step-by-step explanation:

Firstly, you can set up the problem into an equation where the variable X would equal the number of students passing. You put X over the total number of students in the class, turning it into a fraction, then set it equal to the fraction   (which is 75% represented as a fraction).

The fraction can be simplified, because 75 and 100 are both multiples of 25, so after canceling out the 25s you would be left with .

Next, you use the process of cross multiplication which is essentially just multiplying the denominators of both fractions (which would be 28 and 4 in this case) to each side of the equation.

The denominators cancel out leaving you with a simple equation to simplify.

Finally, divide both sides by four in order to isolate the variable.

X = 21.

3

step-by-step explanation:

divide 13.5 by 9 to get the scale factor. it equals 1.5

2 * 1.5 = 3