for every left-handed person there are about 4 right-handed persons. If there are 30 studentsa in a class write and solve a proportion to predict the number of students who are right-handed.

4/5 = x/30

24

Well

To solve this proportion problem, we need to set up a ratio with the given information.

Let's define:
L = Number of left-handed students
R = Number of right-handed students

According to the given information, "for every left-handed person, there are about 4 right-handed persons." This means that the ratio of left-handed students to right-handed students is 1:4.

So, we can create the proportion:

L / R = 1 / 4

Now, we are told that there are 30 students in the class. This means that the total number of students is the sum of left-handed and right-handed students:

L + R = 30

To solve this proportion, we can use the cross-multiplication method.

Cross-multiplication:
L / 1 = R / 4
L = (R / 4)

Now, substitute this value of L into the other equation:

(R / 4) + R = 30

Simplify the equation:

(R + 4R) / 4 = 30
5R / 4 = 30

To isolate R, multiply both sides of the equation by 4:

4 * (5R / 4) = 4 * 30
5R = 120

Divide both sides of the equation by 5 to solve for R:

R = 120 / 5
R = 24

Therefore, the predicted number of right-handed students in the class is 24.