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artcher [175]
3 years ago
11

The Riddler likes to send messages using the ratio of 5:7 , which is the ratio of puzzles to riddles that he sends. If the Riddl

er sent 20 puzzles last week, how many riddles did he send?
Mathematics
1 answer:
kozerog [31]3 years ago
4 0

Answer:

28 riddles

Step-by-step explanation:

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Must m, in the equation y=mx+b=, always be a positive number?
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Of course not. 

If the line rises higher as it goes from left to right,
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3 years ago
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Portia bought 12 bushes and 30 flowers for $240 to plant in her yard. Later, she realized she did not have enough plants and bou
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Answer: the cost of each bush is $15

the cost of each flower is $2

Step-by-step explanation:

Let x represent the cost of each bush.

Let y represent the cost of each flower.

Portia bought 12 bushes and 30 flowers for $240 to plant in her yard. This is expressed as

12x + 30y = 240- - - - - - - - - - -1

Later, she realized she did not have enough plants and bought 7 more bushes and 10 more flowers for $125. This is expressed as

7x + 10y = 125- - - - - - - - - - -2

Multiplying equation 1 by 7 and equation 2 by 12, it becomes

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Subtracting, it becomes

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y = 180/90

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Substituting y = 2 into equation 1, it becomes

12x + 30 × 2 = 240

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12x = 240 - 60 = 180

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