The number of boys and girls in a school are in the ratio 5: 7. What is the number of girls if 1200 boys are there in the school.

Samantha swam upstream for some distance in one hour. she then swam downstream the same river for the same distance in only 12 minutes. if the river flows at 4 mph, how fast can samantha swim in still water?

Two angles are complementary. the larger angle is 36 more than the smaller angle. what is the measure of the larger angle?

Using elimination, what is -4x+2y=-12 4x+8y=-24