the problem is :
a building casts a shadow 100 m long. at the same time a nearby pole 4 m high casts a shadow 8 m long. what is the height of building? round your answer to the nearest tenth if necessary.
2007-03-04 04:08:50 · 3 answers · asked by Anonymous in Education & Reference ➔ Homework Help
The first step is to find the ratio of the shadows.
100/8 = 12.5
Now apply that in reverse to the heights.
4*12.5 = 50
The building was 50m high.
Hope this helps!
2007-03-04 04:17:29 · answer #1 · answered by Catjuggler 2 · 0⤊ 0⤋
the building cast a shadow of 100 meters
and the flagpole has a shadow of 8m and a height of 4m
100 8 <== shadow
----- = -----
x 4 <== length
The point is to find x so you cross multiply
8x = 4x100
8x = 400
x = 400/8
x= 50
The building is 50 meters high!
2007-03-04 12:22:11 · answer #2 · answered by Hope I can hel[ 3 · 0⤊ 0⤋
4 is to 8 as x is to 100
4/8 = x/100
cross multiply
8x = 400
x= 50
2007-03-04 12:20:58 · answer #3 · answered by tonysae 2 · 0⤊ 0⤋