Question 116461
This problem just takes a little thought.  Read it carefully.  If a regular light bulb uses 20 watts less than twice the power of an energy-saver light bulb. Then it is just saying that if e=energy-saver light bulb and r=regular light bulb then 2*e-20=r.  Now you just have to plug 170 in for r and solve for e.  2e-20=170.  Add 20 to both sides and get 2e=190.  Divide by 2 and get e=95.  So if the regular bulb uses 170 watts the energy-saver bulb uses 95 watts.