What is the solution of 3x + y = 9 and 3x − 5y = 15?

What is the volume of this container?

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.

What three-dimensional solid have 6 rectangular faces, 2 equal bases that are not rectangles and 18 edges