Question

Of 200 people, how many people are in junior and senior high school?

COLLEGE : 20%

HIGH
SCHOOL : 30%

JUNIOR AND SENIOR HIGH SCHOOL : ????

Answer 1

Howdy!its 50%

Explanation:

20%= 40

30% = 60

I added 40 and 60 = 100

100= 1/2

20+30= 50.

Answer 2

For this case, we have that the total of people is 200.

If there are 20% of those people in the college, then we make a rule of three to determine the amount:

200 -----------> 100%

x ----------------> 20%

Where "x" represents the number of people who belong to the college.

`x = \frac {20 * 200} {100}\\x = 40`

So, we have 40 people belong to the school.

On the other hand, we use a rule of three to find the number of high school people:

200 ------------> 100%

y ----------------> 30%

Where "y" represents the number of people belonging to the high school.

`y = \frac {30 * 200} {100}\\y = 60`

So, we have 60 people belong to high school.

Answer:

College: 40

High School: 60

60+40=100