the ratio of of empty seats to full seats in an auditorium is 3:7 if there are 203 full seats find the total number of seats

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In the sixth grade 13 out of 20 students have a dog if there are 152 sixth grade students how many of them have a dog

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.