Which is a unit rate?
3:5 2:6 4:7 5:1

Which of the following contains a variable?

1: 4 if the wew 35 surfboards at the beach how many were short boards?

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.