Anna, irina, avel, and vlad are going on a road trip. the following table shows an incomplete probability model for who will be driving during any given kilometer. anna: 1/8 irina: 3/8 avel: ? vlad: 1/8 if the road trip involves 640km of driving, which of the following is the best prediction for the number of kilometers that avel will drive? a. 80 b. 160 c. 240 d. 320

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.