In a school 70% of the students are girls. The number of boys are 510. Then the total number of students in the school is

850

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1700

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1830

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1900

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Solution

The correct option is D 1700
Girls : 70 %
$∴$ Boys : 30% = 510
Total students = x
$∴ \frac{30}{100} \times x = 510$
$∴ x = \frac{510 \times 100}{30}$
$= 1700$

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