Taylor and desmond ran laps after school to train for the football team. the ratio of the number of laps taylor ran to the number of laps desmond ran was 2.3. if taylor ran 4 laps, how many laps did desmond run?

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.