First, let's start off, let us define what are corresponding angles. When a transversal, which is a line that passes through two parallel lines, then the angles in the same corners are congruent.
Using this definition, the angles ∠2 is congruent to ∠6.
There are 80 children. 45 of them are girls. The amount of boys is equal to:

That means there are 45 girls and 35 boys.
The ratio of boys to girls is: 
Simplify:

Your answer is 7:9
For this case we must simplify the following expression:

To do this, we convert the mixed numbers to improper fractions:

Answer:

11(1/3)+(3/4)10 = 11/3+30/4
44/12+60/12=104/4 = 26 cups one box is not enough u will need three