Current location - Training Enrollment Network - Mathematics courses - A math contest was held in grade six of a school.
A math contest was held in grade six of a school.
12(2/5+3/4- 1)= 80 participants. ...

80÷40%=200 ..............................................................................................................................................................

perhaps

Let the number of participants be x, x * 2/5+x * 3/4-12 = x.

0. 15x= 12

x=80

The total number of people is 80/40%=200.

Hope to adopt! thank you