A spelling test was given to a class of 30 students 5/6 of the students gave all the correct answers. How many students made one or more mistakes?

Total no. of students in the class = 30

Total no. od students gave all correct ans. = 5/6 of 30 = 30 x 5 / 6 = 25

So No. of students gave one or more wrong mistakes = 30 - 25 = 5.

Ans.: 5.