At one school, the ratio of boys to girls in the seventh grade is 12:11. There are 66 girls in the seventh grade.
How many boys are there?

Which is greater, 7 p 5 or 7 c 5? 7p5 7c5

Two cars which are 40 miles apart start moving simultaneously in the same direction with constant speeds. if the speed of the car which is behind is 56 mph and the speed of the other car is 48 mph, how many hours will it take for the car which is behind to catch up the car ahead of it?

50 will mark show all use the linear combination method to solve the system of equations. explain each step of your solution. if steps are not explained, you will not receive credit for that step. 2x+9y= -26 -3x-7y=13