Question

1/5 of a class of children signed up for a mathematics competition. There were 10 boys and 30 girls who did not sign up. How many children signed up for the competition

Answer 1

10 children signed up for the competition

Explanation:

1/5

30 girls 10 boys = 4%

the only % left is 1

10 student = 1%

Answer 2

10+30=40(total number of students in the class)
take this number and divide by 5

40/5=8 (students)

ANSWER: 8 students signed up for the competition