nine out of ten students pefer math class over lunch. how many student do not prefer math if 200 students were asked?

20

Step-by-step explanation:

9/10 prefer math

1 - 9/10 = 1/10 don't prefer math

1/10 of 200

1/10 * 200

= 20

9/10 prefer maths over lunch, so technically most of the students prefer maths so we should expect a value close to 200 students.

All you have to do is multiply 200 students by 9 and divide it by 10:

200 x 9/10 = 180 students

So if 200 students were asked, 20 would answer that they prefer lunch over maths because 200 - 180 = 20 (number of students who don't prefer maths)