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3 years ago

6

a meal cost $15. we gave the waiter $18 and told him that the difference was his tip. what percent of the cost of the meal was t

he tip we gave?

2 answers:

Stella [2.4K]3 years ago

6 0

18 - 15 = 3
3/15 = n/100
15n = 300
n = 20

olga2289 [7]3 years ago

6 0

83 percent.
You gave them 18 dollars. As a percentage, your answer is 83%

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Solving a quadratic equation:

Given a second order polynomial expressed by the following equation:

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Rates

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We have that:

Jennifer takes x hours to complete the job on her own, so her rate is 1/x.

Carl needs 15 hours longer than Jennifer, that is, 15 + x hours, so his rate is 1/(15+x).

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$x^2 + 15x = 4(15 + 2x)$

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$x_{1} = \frac{-7 + \sqrt{289}}{2} = 5$

$x_{2} = \frac{-7 - \sqrt{289}}{2} = -12$

Since the time to complete the job has to be a positive value.

Jennifer would complete the job on her own in 5 hours.

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