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trapecia [35]
3 years ago
11

A store manager receives a delivery of 2 boxes of light bulbs.Each box contains 25 lightbulbs.The store manager tests all the li

ghtbulbs and finds that 2pf them are defective.Based on these results ,what can the store manager predict about the next delivery of lightbulbs.
Mathematics
1 answer:
kolezko [41]3 years ago
7 0

Answer:

Step-by-step explanation:

A delivery of 4 boxes will contain 2 more defective lightbulbs than a delivery of 2 boxes.

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It takes 14 girls 48 minutes to finish painting a mural. How long would it take if only 4 girls painted the mural?
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It would take 13.7142857 or 13.7, in better terms about 14 minutes.

Step-by-step explanation:

48/14 = 3.42857143

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Is this calculus or something?
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3 years ago
Mrs. Julien’s and Mrs. Castillejo’s classes are selling cookie dough for a school fundraiser. Customers can buy packages of maca
Oksi-84 [34.3K]

Answer: the cost of one package of macadamia nut chip cookie dough is $1.5

the cost of one package of triple chocolate cookie dough is $2.5

Step-by-step explanation:

Let x represent the cost of one package of macadamia nut chip cookie dough.

Let y represent the cost of one package of triple chocolate cookie dough.

Mrs. Julien’s class sold 25 packages of macadamia nut chip cookie dough and 30 packages of triple chocolate cookie dough for a total of $112.50. This means that

25x + 30y = 112.5 - - - - - - - - - - - - -1

Mrs. Castillejo’s class sold 8 packages of macadamia nut chip cookie dough and 45 packages of triple chocolate cookie dough for a total of $124.50. This means that

8x + 45y = 124.5 - - - - - - - - - - -2

Multiplying equation 1 by 8 and equation 2 by 25, it becomes

200x + 240y = 900

200x + 1125 = 3112.5

Subtracting, it becomes

- 885y = - 2212.5

y = - 2212.5/- 885

y = 2.5

Substituting y = 2.5 into equation 1, it becomes

25x + 30 × 2.5 = 112.5

25x + 75 = 112.5

25x = 112.5 - 75 = 37.5

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The method used is the elimination method. It is more convenient to use.

8 0
3 years ago
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