Question

There are $50$ cards in total. $\frac{7}{25}$ of the total number of cards are red and blue. Of those, $\frac{2}{7}$ are red. How many blue cards are there?

• A. $\text{None}$
• B. $50$
• C. $14$
• D. $10$

Answer 1

The correct option is D $10$

Detailed step-by-step solution:
Total number of cards = $50$

Cards which are red and blue color =
$\frac{7}{25}\times 50=14$

Number of red cards = $\frac{2}{7}\text{of}14=\frac{2}{7}\times 14=4$

Number of blue cards = $14-4=10$

Hence, option C is correct.