Posted by karin on Sunday, November 4, 2012 at 1:20am.
if you are 6 ft tall and cast a 90" shadow and are standing 70" from a lamp how tall is the lamp

math  Steve, Sunday, November 4, 2012 at 1:39am
since 6' = 72 inches, if the lamp is x inches tall,
x/(70+90) = 72/90
x = 128

math  karin, Sunday, November 4, 2012 at 2:01am
can you further explain the part where you stated...
x/(70+90)=72/90
when I take 72/90 I get .8
I must be missing something here...

math  Steve, Sunday, November 4, 2012 at 2:50am
draw a diagram. Two ratios are the same
lamp height:distance to shadow tip
person height:length of shadow
so,
x/160 = .8
x = 128
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