Ответ:

84. Решение:

  1. а) 60% = \(\frac{60}{100}\) = \(\frac{3}{5}\)
  2. б) 75% = \(\frac{75}{100}\) = \(\frac{3}{4}\)
  3. в) 15% = \(\frac{15}{100}\) = \(\frac{3}{20}\)
  4. г) 31% = \(\frac{31}{100}\)