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April 28th, 2017, 01:39 PM   #1
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Se der 12 a cada garoto, ficarei ainda com 60. Para dar 15 a cada um precisarei de mais 6. Quantos são os garotos?
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April 28th, 2017, 02:34 PM   #2
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$12n = T + 60$

$15n = T-6$

Restar la primera ecuación de la segunda

$3n = 60-(-6) = 66$

$n = 22$
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