If a 12-meter-tall airplane hangar casts a 18-meter shadow at the same time a parked jet casts a 6-meter shadow , how tall is the jet?

Given 
  12 meters tall airplane
  18 meter shadow of airplane
  6 meter shadow of jet
Find the measurement of the jet (y)
Solution
 6y = 12 + 18                         30
       >     y   =    >  y= 5
 6           6                              6

The answer is 5 meters tall is the measurement of a parked jet. 

Many things that seem threatening in the dark become welcoming when we shine light on them