Respuesta :

let oil change be x
91 / 7 = x / 11
(91 * 11) / 7 = x
13 * 11 = x
143 = x Ans
calculista

Answer:

[tex]143\ oil\ changes[/tex]

Step-by-step explanation:

we know that

Frances can complete [tex]91[/tex] oil changes in [tex]7[/tex] days

so

by proportion

Find how many oil changes complete in [tex]11[/tex] days

[tex]\frac{91}{7}\frac{oil\ changes}{days} =\frac{x}{11}\frac{oil\ changes}{days}\\ \\x=11*91/7\\ \\x=143\ oil\ changes[/tex]

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