(4 + 3) x 10 ÷ 2 + (5 x 6)

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A50% increase followed by 33 1/2% decrease

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.

What adds to be the bottom number but also multiplies to be the top number with 8 on the bottom and 15 on top