Among the four cards below, exactly some are equivalent to 4/7. Cards: 8/14, 12/21, 16/28, 20/36. How many cards are equivalent to 4/7?

Question

Accepted Answer

3. 8/14 = 4/7, 12/21 = 4/7, 16/28 = 4/7, but 20/36 = 5/9 (not 4/7). So 3 cards match.

Among the four cards below, exactly some are equivalent to $\frac{4}{7}$ .
Cards: $\frac{8}{14}, \frac{12}{21}, \frac{16}{28}, \frac{20}{36}$ .
How many cards are equivalent to $\frac{4}{7}$ ?