2006-11-13 08:02:10 · 10 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
15x=12
x=12/15
x=0.8
yx=18
y*0.8=18
y=18/0.8
y=22.5
the stick would be 22.5 inches long
2006-11-13 08:09:05 · answer #1 · answered by TheLastPrincess 4 · 0⤊ 0⤋
Use the porportion "15 is to 12 as Length is to 18"
15 / 12 = Length / 18
Length = 18 x 15/12
Length = 22.5 inches
2006-11-13 16:09:16 · answer #2 · answered by Richard S 6 · 0⤊ 0⤋
The answer is 22.5"
Do it as ratios:
15 / 12 = x / 18
x = 15 / 12 * 18
x = 5 / 4 * 18
x = 90 / 4
x = 22.5"
It would take a 22.5" stick to cast an 18 inch shadow.
(A quick way to see this is to see that the shadow is 50% longer, so the stick should also be 50% longer... 15" * 1.5 = 22.5")
2006-11-13 16:04:02 · answer #3 · answered by Puzzling 7 · 0⤊ 0⤋
Similar Triangles
18/12 = 1.5
1.5*15=22.5
22.5 inches long
2006-11-13 16:06:19 · answer #4 · answered by jerzey79 2 · 0⤊ 0⤋
15/12=x/18
x=15*18/12=22.5 "
2006-11-13 16:14:45 · answer #5 · answered by yupchagee 7 · 0⤊ 0⤋
15/12=x/18
x=22.5
2006-11-13 16:07:19 · answer #6 · answered by HOME SLICE! 2 · 0⤊ 0⤋
the stick would be 14.4 in. long because you 18/15 = 1.2 & then 1.2 x 12 = 14.4 in
2006-11-13 16:10:37 · answer #7 · answered by S.E.A. 0021 2 · 0⤊ 0⤋
15 X 1.5 =
2006-11-13 16:05:51 · answer #8 · answered by Gaspode 7 · 1⤊ 0⤋
22.5 inches
2006-11-13 16:04:14 · answer #9 · answered by ? 7 · 0⤊ 0⤋
22.5 inches.
2006-11-13 16:04:58 · answer #10 · answered by entropy 3 · 0⤊ 0⤋