Laura rode her bike for 3 5/8 hours on saturday and for 4 1/4 hours on sunday. which is the best estimate of time laura spent riding her bike on saturday and sunday?

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.