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krok68 [10]
3 years ago
14

A printer prints 28 photos in 8 minutes. a. How many minutes does it take to print 21 more photos? b. Construct a double number

line diagram that represents the situation. How many minutes does it take to print 35 more photos?
Mathematics
1 answer:
Vlad [161]3 years ago
5 0
Now, "21 more photos" is 21 added to the already printed 28, so 21 more is 28+21 photos, or 49,

\bf \begin{array}{ccll}
photos&minutes\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
28&8\\
49&m
\end{array}\implies \cfrac{28}{49}=\cfrac{8}{m}\implies m=\cfrac{49\cdot 8}{28}

what about 35 more?   well, it already printed 49, and 35 more would then be 84,

\bf \begin{array}{ccll}
photos&minutes\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
28&8\\
84&m
\end{array}\implies \cfrac{28}{84}=\cfrac{8}{m}\implies m=\cfrac{84\cdot 8}{28}
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