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Andrej [43]
3 years ago
7

I wrote these questions as one big question but decided to do them separately...

Mathematics
1 answer:
Alex17521 [72]3 years ago
5 0

Answer:

448 tracks

Step-by-step explanation:

So first we need to figure out what 28% of 350 is and then add that value onto 350.

  • First we need to convert 28% into a decimal or a fraction
  • 28% is equivalent to 0.28, \frac{28}{100}, and \frac{7}{25}
  • I will use 0.28 for simplicity

To figure out what 28% of 350 is, we need to multiply 350 by one of the three options above

  • (350)(0.28) = <u>98 tracks</u>

Now that we have figured out what 28% of 350 is, we can now add this value to 350 to get the total number of tracks.

  • 350 + 98 = 448 tracks
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Harrison has $9.30 in his coin collection all in pennies and dimes the number of dimes is three times the number of pennies how
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Answer:

Number of Pennies = 30

Number of Dimes = 90

Step-by-step explanation:

Let the number of pennies be p and number of dimes be d

We can write 2 equations and use substitution method to solve.

<u>Total value of all the coins is 9.30:</u>

We can write:

0.01p + 0.1d = 9.30

Note: value of penny is 0.01 and dime is 0.1, in dollars

<u>Number of dimes is 3 times number of pennies:</u>

We can write:

d = 3p

Now putting 2nd equation in first and solving for p:

0.01p + 0.1(3p) = 9.30

0.01p + 0.3p = 9.30

0.31 p = 9.30

p = 9.30 /0.31

p = 30

Now we know d = 3p, so d = 3 (30) = 90

Hence

Number of Pennies = 30

Number of Dimes = 90

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