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ser-zykov [4K]
3 years ago
7

George has a small coin collection.  He has collected 16 gold coins, 28 silver coins, 32 copper coins, and4 bronze coins. At a f

lea market, George sells 15% of his coins. Find the number of coins he sold.
Mathematics
2 answers:
Neko [114]3 years ago
6 0
He sold 12 coins, 16+28+32+4=80. 15% of 80 is 12
My name is Ann [436]3 years ago
5 0

Answer: 12 coins

Step-by-step explanation:When you add up all the coins you get 80. 15% of 80 is 12.

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Tim typed a 46-word paragraph in 3/4 of a minute. What is his typing speed per minute?
Rudik [331]

Answer: 61.33333.... wpm

Step-by-step explanation:

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2 years ago
It took Ivan 7.5 hours to drive 412.5 miles. How fast was he driving?
Tju [1.3M]
Since the question is asking how fast he is driving, we need to find his speed in miles per hour. To do this, you need to divide the amount of miles he drove by the amount of hours it took. When you do 412.5/7.5, you get the answer of 55 miles per hour. 
6 0
3 years ago
Is 12/42=10/35 a true proportion
olya-2409 [2.1K]
Yes, they both are 2/7

Proof: Left-hand side

Simplify the following:
12/42

The gcd of 12 and 42 is 6, so 12/42 = (6×2)/(6×7) = 6/6×2/7 = 2/7:
Answer:  2/7
Right-hand side:

Simplify the following:
10/35
The gcd of 10 and 35 is 5, so 10/35 = (5×2)/(5×7) = 5/5×2/7 = 2/7:
Answer:  2/7
3 0
3 years ago
Need help on 6 and 7 asap! Will mark brainliest!!
MrMuchimi

I did number 6 to give you an idea of what you have to do. First find simplify the top and bottom and reduce!

Hope it helps! Comment if you have any questions!

3 0
3 years ago
Read 2 more answers
This is my my second to <br>last one, thanks for helping me
icang [17]

9514 1404 393

Answer:

  • $9
  • Option 4

Step-by-step explanation:

The equations need to match the problem statements. If we let C and S represent the costs of Cherry and Sweet potato pies, respectively, then the revenue from each sale can be expressed as an equation.

  1 cherry and 7 sweet potato for $114   ⇒   C +7S = 114

  14 sweet potato and 11 cherry for $309   ⇒   11C +14S = 309

Note that we have used C and S in the second equation in the same order as they appeared in the first equation, even though the problem statement has that order reversed. This facilitates solving the equations using elimination or Cramer's rule.

These equations match Option 4.

__

The cost of a cherry pie can be found by eliminating S from the equations. We can do that by subtracting twice the first equation from the second:

  (11C +14S) -2(C +7S) = (309) -2(114)

  9C = 81 . . . . . simplify

  C = 9 . . . . . . . divide by 9

The cost of each cherry pie is $9.

3 0
3 years ago
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