Respuesta :
According to the percentage calculation, 40 percentage of boys bring lunch to school.
What is the percentage calculation?
"Percentage can be calculated by dividing the value by the total value, and then multiplying the result by 100. The formula used to calculate percentage is: (value/total value)×100%."
Given, the total number of boys in that school = (12 + 18) = 30.
Number of boys that bring lunch to school = 12.
Therefore, the percentage of boys who bring lunch to school is
= [tex]\frac{12}{30}[/tex] × 100% = 40%.
Therefore, 40% of total boys bring lunch to school.
Learn more about the percentage calculation here: https://brainly.com/question/13325996
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