Question

The number of boys taking Cooking classes is what percent of the total number of children in the school? Round off your answer to two digits after the decimal.

• A. $9.68\%$
• B. $12.61\%$
• C. $10.71\%$
• D. $8.43\%$
• E. None of these

Answer 1

The correct option is C $10.71\%$

Number of girls $=\frac{4}{7}\times 2800=1600$
Number of boys $=1200$
Number of boys in Painting $=\frac{1020}{5}=240$
Number of girls in Cooking clases $=\frac{1}{4}\times 1600=400$
Number of boys in Cooking classes $=700-400=300$
Number of boys in Singing classes $=\frac{2}{5}\times 1200=480$
Number of boys in Dancing classes $=1200-240-300-480=180$
Number of girls in Singing classes $=2\times 480=960$
Number of girls in Dancing classes $=\frac{5}{4}\times 180=255$
Number of girls in Painting classes $=1600-400-960-225=15$
Required per cent $=\frac{300}{2800}\times 100=10.71\%$