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sesenic [268]
3 years ago
14

20 points please help!!

Mathematics
1 answer:
Amanda [17]3 years ago
6 0

Answer:

3/7+r = 13/15

r=46/105

Step-by-step explanation:

Given ribbon of her project= 13/15

Used 3/7

left=r

3/7+r = 13/15

r=13/15 - 3/7

r=46/105

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A sports stadium has 10000 seats, divided into box seats, lower-deck seats, and upper-devk seats. Box seats sell for 10 dollars,
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Answer:

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Number of lower deck seats = 5000

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Step-by-step explanation:

Let number of box seats = x

Let number of lower deck seats = y

Let number of upper deck seats = z

As per question statement:

x+y+z=10000 ...... (1)

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Cost for x box seats = 10x

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Cost for y lower deck seats = 8y

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As per question statement:

10x+8y+5z=70000 ..... (2)

z = 4x ..... (3)

Putting value of y in (1) and (2):

x+y+4x=10000\\\Rightarrow 5x+y=10000 ....... (4)

10x+8 y+5\times 4x=70000\\\Rightarrow 30x+8y=70000 ..... (5)

8 \times (4) - (5):

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\Rightarrow x = 1000

By (3):

z = 4000

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