Question 156631
using similar triangles __ the height of the lamp (12) is to the end of the shadow (d+L)
__ as the woman's height (5) is to the length of the shadow (L)


{{{12/(d+L)=5/L}}} __ "cross" multiplying __ 12L=5d+5L __ subtracting 5L __ 7L=5d __ dividing by 7 __ L=5d/7