Question

in a school, there are 2400 children. 1/2 of them are studying in primary class, 1/3 of them are studying in middle class and the remaining are studying in high school​

Answer 1

Step-by-step explanation:

Number of students=2400

Students in primary class=1/2*2400

=1200

Students in middle class=1/3*2400

=800

Now,

Number of students in higher class=Students in primary class-Students in middle class

=1200-800

=400

Therefore, there are 400 students in high class.

Answer 2

Step-by-step explanation:

1 upon 2 x 1 upon 3 = 1 upon 6