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aivan3 [116]
3 years ago
7

Person 1 can do a certain job in twenty-one minutes, and person 2 can do the same job in twenty-eight minutes. When completing t

he job together, which expression would be used to represent the amount of work done by person 1?
21
1/21
x/21
21x
Mathematics
2 answers:
dangina [55]3 years ago
8 0
The amount of work (or the rate) done by the first person is 1/21
r = 1/21
Sedaia [141]3 years ago
5 0

Answer:

\frac{1}{21} would be used to represent the amount of work done by person 1.

Step-by-step explanation:

When someone does a work in x time,

Then, the work done by the person in one day = \frac{1}{x}

Given,

Time taken by person 1 = 21 minutes

Thus, by the above statement,

The one day work of person 1 = \frac{1}{21}

Hence, \frac{1}{21} would be used to represent the amount of work done by person 1.

Second option is correct.

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Answer:

C.) 418 cm²

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Step-by-step explanation:

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You are selling candy and wrapping paper for the band's Christmas fundraiser. The candy sells for 8 dollars per box and the wrap
Ludmilka [50]

Answer:

The number of boxes of candy sold is 4

The number of rolls of wrapping paper sold is 10

Step-by-step explanation:

Let x = number of boxes of candy that was sold.

Let y = number of rolls of wrapping paper was sold.

The candy sells for 8 dollars per box and the wrapping paper sells for 6 dollars per roll. This means that x boxes of candy and y rolls of wrapping paper will be sold for

$(8x + 6y)

If you have sold 14 items, and collected 92 dollars, this means that

x + y = 14

8x + 6y = 92 - - - - - - -1

Substituting x = 14 - y into equation 1, it becomes

8(14-y) + 6y = 92

112 - 8y + 6y = 92

- 8y + 6y = 92 - 112

-2y = -20

y = 20/2 = 10

x = 14 - y

x = 14 - 10

x = 4

The number of boxes of candy sold is 4.

The number of rolls of wrapping paper sold is 10.

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