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Kaitlin purchased a prepaid phone card for $15. Long distance calls cost 16 cents a minute using this card. Kaitlin used her card only once to make a longdistance call. If the remaining credit on her card is $9.88, how many minutes did her call last?

Respuesta :

[tex]15-0.16x=9.88[/tex]

where x is the minutes

we can solve x

[tex]\begin{gathered} -0.16x=9.88-15 \\ -0.16x=-5.12 \\ 0.16x=5.12 \\ x=\frac{5.12}{0.16} \\ x=32 \end{gathered}[/tex]

so your call lasted 32 minutes

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