Respuesta :
7
Step-by-step explanation:
4/12 which simplifies down to 1/3 meaning 1 pack is 3 dollars each . well 21/3 is 7
Number of baseball card packs purchased for $21 is equals to 7.
What is proportion?
" A proportion is defined as when two or more ratios of the given number are equivalent to each other."
Formula used
a, b, c, d are in proportion
Therefore , [tex]\frac{a}{b} =\frac{c}{d}[/tex]
According to the question,
Number of baseball card packs purchased in $12 = 4
Number of baseball card packs purchased in $21 = x
As per the definition of proportion we have,
[tex]\frac{4}{12} = \frac{x}{21}[/tex]
⇒12 × x = 4 × 21
⇒ x = (4 × 21) /12
⇒ x = 7 baseball card packs
Hence, number of baseball card packs purchased for $21 is equals to 7
Learn more about proportion here
https://brainly.com/question/2548537
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