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mylen [45]
2 years ago
11

The perimeter of a square field is 60 M find its area​

Mathematics
2 answers:
Eddi Din [679]2 years ago
8 0

Answer:

225m^{2}

Step-by-step explanation:

A square has 4 sides that are equal. 60 ÷ 4 = 15

15m per side

Area of square = b x h

Area of this square field = 15 x 15 = 225m^2

saul85 [17]2 years ago
7 0

Answer:

<u><em>225 m²</em></u>

Step-by-step explanation:

Perimeter = Side length x 4 = 60 m

Side length = 60/4

= 15 m

Area = side length x side length

= 15 x 15

= 225 m²

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Of 560 marbles in a bag, 65% are red and the rest are blue. After 28 red marbles are replaced with blue ones, how many blue marb
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Answer:  The answer is 400  blue marbles.


Step-by-step explanation: Given that there are 560 marbles in a bag, out of which 65% are red and rest are blue.

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n_r=65\%\times 560=\dfrac{65}{100}\times 560=364,

and number of blue marbles is

n_b=560-364=196.

Now, if 28 red marbles are replaced by blue marbles, the the new number of red and blue marbles will be

n_r^\prime=364-28=336~~~\textup{and}~~~n_b^\prime=196+28=224.

Now, to get 65% of the marbles blue, we need to add some more blue marbles to the bag. Let 'x' number of blue marbles are added to the bag, then

65\%\times (560+x)=224+x\\\\\Rightarrow \dfrac{65}{100}\times (560+x)=224+x\\\\\Rightarrow 13(560+x)=20(224+x)\\\\\Rightarrow 7280+13x=4480+20x\\\\\Rightarrow 7x=2800\\\\\Rightarrow x=400.

Thus, 400 blue marbles need to be added to the bag.


5 0
3 years ago
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