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eduard
2 years ago
10

5. I have 25 coins consisting of 5-cent and 50-cent pieces. If the total value is $7.10, how many 5-cent coins do I

Mathematics
1 answer:
VARVARA [1.3K]2 years ago
6 0

Answer:

x = # of 5 cent coins

y = # of 50 cent coins

x+y=25

.05x+.5y=7.1

y=25-x

(.05x+.5(25-x)=7.1)100

5x+50(25-x)=710

5x+1250-50x=710

-45x=-540

x=12

You have 12, 5 cent coins and 13, 50 cent coins.

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6 0
2 years ago
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a company added a new oil tank that holds 350 barrels of oil more than its old oil tank. Together they hold 3650 barrels of oil.
Tcecarenko [31]

Answer:

Capacity of old tank =  1650 barrels.    

Capacity of new tank =  2000 barrels.  

Explanation:

  Let a be the capacity of old tank and b be the capacity of new tank.

 A company added a new oil tank that holds 350 barrels of oil more than its old oil tank.

So we have    b - a  = 350 ----------------------equation 1

Together they hold 3650 barrels of oil

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equation 1 + equation 2

                       2b = 3650 + 350 = 4000

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Substituting in equation 1

                  2000 - a = 350

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Capacity of old tank =  1650 barrels.    

Capacity of new tank =  2000 barrels.        

 

4 0
3 years ago
There were 212 089 visitors to a tourist attraction last year. Express this
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Answer:

212,000

Step-by-step explanation:

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As an example, 212,589 would round up to 213,000, and

212,389 would round down to 212,000.

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3 years ago
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Step-by-step explanation:

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Answer:

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Hope this helps.

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8 0
3 years ago
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