What is the surface area of the prism?

If 1 is divided by the sum of y& 4.the result is equal to 3 divided by 4, find the value of m

Some boys and girls were asked if they had a pet. one third of the group were boys. there were 20 boys. 20% of the girls had a pet. boys with a pet : girls with a pet = 1 : 5 i need to know how many girls there are.

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels