Question

find the number between 1 and 50 which having exactly 3 factors

Answer 1

4 is the number having exactly three factors, 1, 2, 4

Answer 2

$4 \times \frac{4}{5} \div \frac{3}{5}of5 + \frac{4}{5} \times \frac{3}{10} - \frac{1}{5}$