A store owner wants to develop a new snack mix by mixing chocolate and trail mix. How many pounds of chocolate costing $13.80 per pound should be mixed with 19 pounds of trail mix costing $4.00 per pound to create a mixture worth $7.98 per pound. The owner needs to mix
pounds of chocolate (round to the nearest whole pound - NO COMMAS).

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.