The vet at the aquarium is monitoring a sick octopus. At the start of the week, the octopus weighed 2 9/10 kilograms. He lost 4/5 kilograms over the week. How much does the Octopus weigh now? eh

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.