The perimeter of a rectangular pool is 72 meters. If the length of the pool is twice its breadth. Its length is_________.
1 answer:
Answer:
Length = 18 meters
Step-by-step explanation:
Let the length of the rectangular pool = l meters
And breadth of the pool = w meters
Perimeter of the rectangular pool = 2(l + 2w)
Since, perimeter of the rectangular pool is 72 meters.
2(l + 2w) = 72
l + 2w = 36 --------(1)
If length of the pool is twice of its breadth,
l = 2w
w = -------(2)
By substituting the value of 'w' from equation (2) to equation (1),
2l = 36
l = 18 meters
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Answer:
x=1, y=3
Step-by-step explanation:
21x + 7y = 42
Divide this by 7
3x +y = 6
-5x +5y = 10
Divide this by 5
-x+y = 2
Subtract the two equations to eliminate y
3x +y = 6
-(-x+y = 2)
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+x-y = -2
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4x = 4
Divide by 4
x = 1
Now solve for y
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-1 +y = 2
Add 1 to each side
y = 2+1
y =3
