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Study the graph and answer the question∶  The ratio of the number of boys to that of girls who passed from school A is 5 ∶ 4 and the ratio of the number of girls to the number of boys who passed from school C is 4 ∶ 3. The total number of girls passed from schools A and C is what per cent of the total number of students who appeared from schools B and D? (Correct to one decimal place)

Study the graph and answer the question∶  The ratio of the number of boys to that of girls who passed from school A is 5 ∶ 4 and the ratio of the number of girls to the number of boys who passed from school C is 4 ∶ 3. The total number of girls passed from schools A and C is what per cent of the total number of students who appeared from schools B and D? (Correct to one decimal place) Correct Answer <span style="">32.7%</span>

Calculation:

In the case of School A,

Passed boys = 5/(5 + 4) × 180 = 100

Passed girls = 180 - 100 = 80

In the case of School C,

Passed boys = 3/(4 + 3) × 175 = 75

Passed girls = 175 - 75 = 100

Hence, 

The total number of girls passed from schools A and C = 80 + 100 = 180

The total number of students who appeared from schools B and D = 225 + 325 = 550

% = 180/550 × 100% ≈ 32.7%

∴ The total number of girls passed from schools A and C is 32.7% of the total number of students who appeared from schools B and D.

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