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MrRa [10]
2 years ago
11

The first barn contained 3 times more hay than the second one. After 20 tons of hay were removed from the first barn and 20 tons

were added to the second barn, the amount of hay in the second barn was 5/7 of the amount remaining in the first barn. How many tons of hay was there in each barn?
Mathematics
1 answer:
pentagon [3]2 years ago
6 0

Answer:

Amount of hay in first barn = 90 tons

Amount of hay in second barn song = 30 tons                

Step-by-step explanation:

Let the amount of hay in second barn be x, then hay in first barn will be 3x.

20 tons of hay was removed from first barn and ws added to second barn.

Now, the amount of hay in first barn = 3x -20

Amount of hay in second barn = x+20

The equation now formed is:

x+20 = \frac{5}{7}(3x-20)

7x+14 = 15x -100

-8x = -240

8x = 240

x = 30

3x = 90

Amount of hay in first barn = 90 tons

Amount of hay in second barn song = 30 tons          



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Answer:

279 silvery minnow

Step-by-step explanation:

Number of Silvery Minnows initially tagged = 54

Number of minnows captured = 62

Number of tagged minnows in captured ones = 12

Remember that in the very beginning there were no tagged minnows. 54 minnows were captured, tagged and released. This means, there are total 54 tagged minnows in the entire population. Lets say there are x number of minnows in total.

So, in x minnows, 54 are tagged ones.

When 62 minnows are captured, only 12 are tagged ones and remaining are un-tagged. Since, the minnows were randomly captured, we can develop a proportion from this case to estimate the total population of minnows in the Rio Grande River.

Ratio of tagged minnows to total population must be equal to the ratio of captured tagged minnows in total captured minnows.

i.e.

54 : x = 12 : 62\\\\ \frac{54}{x} = \frac{12}{62}\\\\ 62(54)=12x\\ \\ x = 279

This means, there were 279 silvery minnows in the Rio Grande River.

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2.8 meters linen divided into 45 cm pieces = # of pieces and waste
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2.8 meter= 2800cms

To solve this, we can create a simple algebraic equation:
45x=2800
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You can make 62 full pieces.

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