At a school, 171 students play at least one sport. this is 75% of the school. how many students are at the school

X=number of students.
75% of x=171
Therefore:
(75/100)x=171
x=(171*100)/75=228

there are 228 students at the school.

You can find the area of a rectangle by multiplying the length and height. so multiply 1/2*7/4(which is the simpler version of 1 3/4) and you get 7/8 as your answer.