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(a) Assuming the vertical line is straight and pass thru the origin of the pie chart,

50% -10% = 40% of students like basketball.

(b) Ratio of pupils like swimming: pupils like soccer = 2: 3

And ratio of both total pupils who both like swimming and soccer is 50%,

pupils who like swimming is 20%

(c) Total number of pupils in the blue house = 75/30% = 75/30 * 100 = 250

(d) 50% -10% = 40%

Difference in number of  pupils between most popular and least popular sports = 250 * 40% = 100

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Thanks

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