The sum of three numbers is 14. The largest number is 4 times the smallest number. The sum of the smallest number and twice the largest number is 18. Find the three numbers
involved by using inverse matrix method. What is the smallest and largest number?

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.