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20 14 mathematics of the second set of simulation questions in grade three
(1)18 ÷ (1-77.5%) =18 ÷ 22.5% = 80 (person);

80-22-28- 18= 12 (person).

A: There are 80 people in Selected Graduates, of whom 12 have achieved Grade C;

(2) The central angle of the number of D-level students in the sector statistical chart as shown in the figure is 360× 22.5% = 81;

(3) The total number of A-level mathematics students in the county is about: 1600×(22÷80)=440 (people).

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