Respuesta :

Answer:

  1. 30%
  2. 30%

Step-by-step explanation:

[tex]7\:out\:of\:ten\\10-7 = 3\\3\:people\:don't\:brush\\\\\frac{3}{10} \times 100\\\\\frac{300}{10} \\\\=30\%[/tex]

[tex]\frac{18}{60} \times 100\\ \\\frac{1800}{60} \\\\= 30\%[/tex]

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