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The perimeter of a rectangle is 30 inches The length is seven inches more than the width What is the length?
4 inches wide, 11 inches long.
11(length) -4(width) = 7
11*2 = 22 (2 long sides)
4*2 = 8 (2 short sides)
total sides = 30
this one is not too difficult to do in your head, but for similar problems you can use a system of equations.
x + 7 = y
2x +2y = 30
(x is width, y is length)
P=2(L+W)=7+W+W=7+2W
2W=30-7=23
W=23/2=11.5 SORRY INCORRECT WORKING OUT THE ABOVE IS CORRECT (sorry about the shouting)
What else can I help you with?
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the perimeter of a triangle is 86 inches. the largest side is four inches less than twice the smallest side. the third side is 10 inches longer than the smallest side. what is the length of each side?
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