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aivan3 [116]
3 years ago
15

The prices of two radios are in the ratio x:y

Mathematics
2 answers:
kobusy [5.1K]3 years ago
4 0

Answer:

<u>4:1</u>

Step-by-step explanation:

2(x+20) = 5(y+20)

2x + 40 = 5y + 100

2x - 5y = 60

1(x-5) = 5(y-5)

x - 5 = 5y - 25

x - 5y = -20

<u>x = 80</u> (solve the two equations simultaneously)

80 - 5y = -20

5y = 100

<u>y = 20 </u>

x:y = 80:20

x:y = 4:1

PolarNik [594]3 years ago
3 0

Answer:

x : y = 4 : 1

Step-by-step explanation:

(x+20) : (y+20) = 5 : 2    and   (x-5) : (y-5) = 5 : 1

When we multiply the outer and inner members we get:

2x+40 = 5y+100     and  x-5 = 5y-25

When we arrange the both equations we get:

2x-5y = 60  and x-5y = -20

When we subtract second equation from the first we get:

x = 80   Now we will replace x=80 in the second equation and get:

80-5y = -20 => -5y= -20-80 => -5y= - 100  

Now we will multiply the both sides with number (-1) and get:

5y= 100 => y= 100/5 = 20 => y=20

x : y = 80 : 20 => x : y = 4 : 1

God with you!!!


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Novosadov [1.4K]
Let A represent the speed of car A. Using your formula,
.. A*2 = D
.. (A +15)*1.5 = D . . . . . the same distance in a shorter time at a higher speed

Equating the two expressions for D, we get
.. 2A = 1.5(A +15)
.. 2A = 1.5A +22.5 . . . . . eliminate parentheses
.. 0.5A = 22.5 . . . . . . . . .subtract 1.5A
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7 0
3 years ago
A rectangle has a heigh if 4x^3 and a width of x^3+3x^2+2x
Andrews [41]

Answer:

Area = 4x^6+12x^5+8x^4

Step-by-step explanation:

<u>The Complete Question:</u>

A rectangle has height  4x^3  and width  x^3+3x^2+2x. What is the area of the rectangle in terms of x?

<u>Solution:</u>

The formula for the area of a rectangle is:

Area = Height * Width

Both the expressions for height and width is given, so we just need to multiply both the expressions to get an expression, in x, for the area of the rectangle. The algebra is shown below:

A=(4x^3)(x^3+3x^2+2x)\\A=4x^6+12x^5+8x^4

This is the area of the rectangle.

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disa [49]
Go with what u think will help u
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2 years ago
Sum of two numbers is 24 and the difference is 15.What are the two numbers ?
Alexeev081 [22]
Let,
the bigger number  be "x"
the smaller number be "y"
Now, according to the question,
x + y = 24...........equation (1).............because the sum of numbers is 24
x - y = 15 .............equation (2)..................because their difference is 15

Taking equation (2),
x - y = 15
x = 15 + y ....................equation (3)

Now, Taking equation (1)
x + y = 24
(Substituting the value of "x" form equation (3) we get)
15 + y + y = 24
(Subtracting 15 on both sides, we get)
y + y = 24 - 15
2y = 9
y = 9 / 2
y = 4.5
Now, 
Taking equation (3)
x = 15 + y
(Substituting the value of y , we get)
x = 15 + 4.5
x = 19.5

So, the two numbers are 19.5 and 4.5

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in the school cafeteria, students choose their lunch from 3 sandwiches, 3 soups, 4 salads and 2 drinks.how many different lunche
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This is combinations
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3 options for sandwitch
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we multiply all together
3 times 3 times 4 times 2=72 options
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