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3 years ago

9

$48The cost, c, of a ham sandwich at a deli varies directly with the number of sandwiches, n. If c = $54 when n is 9, what is th

e cost of the sandwiches when n is 3?
$18
$21
$27
$48

1 answer:

crimeas [40]3 years ago

3 0

Answer:

c=18

Step-by-step explanation:

54 divided by 9 is 6

6 times 3 is 18

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I started by creating a ratio:

$\frac{x}{0.18} + \frac{360}{0.10} = \frac{x+360}{0.15}$

<em>Where 'x' is the desired amount of the 18% solution of sulfuric acid.

</em>From here, I solved for 'x':
<em>
</em> $\frac{0.10x}{0.018} + \frac{360(0.18)}{0.018} = \frac{x+360}{0.15}$
$\frac{0.10x}{0.018} + \frac{64.8}{0.018} = \frac{x+360}{0.15}$
$\frac{0.10x+64.8}{0.018} = \frac{x+360}{0.15}$
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$0.015x+9.72 = 0.018x+6.48$
$0.003x = 3.24$
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∴You will need to add 1080ml of 18% Sulfuric Acid in order to obtain a 15% solution.

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