Asked by Anonymous
The length of the rectangular bookmark required to Ella is 16 minus thrice its width. If the perimeter is 20 inches, determine its length and width.
Answers
Answered by
Anonymous
L = 16 - 3 w
L + w = 20/2 = 10
so L = 10-w
10 - w = 16 - 3 w
2 w = 6
w = 3
L = 10 - 3 = 7
===================
check
--------------------------
16 - 9 = 7 sure enough
2(7) + 2(3) = 14 + 6 = 20 . Whew !
L + w = 20/2 = 10
so L = 10-w
10 - w = 16 - 3 w
2 w = 6
w = 3
L = 10 - 3 = 7
===================
check
--------------------------
16 - 9 = 7 sure enough
2(7) + 2(3) = 14 + 6 = 20 . Whew !
Answered by
henry2,
L = 16-3W
2(16-3W)+2W = 20
16-3W+W = 10
W = 3 in.
L = 16-3W = 16-9 = 7in.
9
2(16-3W)+2W = 20
16-3W+W = 10
W = 3 in.
L = 16-3W = 16-9 = 7in.
9
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