A mobile is being constructed to hang above a babies crib. The horizontal rod that the mobile is hanging on is one meter long and has a mass of 90 grams. A blue star is located at the left end of the rod and has a mass of 105 grams. A grey circle is 60 cm from the left end and has a mass of 17 grams. An orange heart is located 90 cm from the left end and has a mass of 21 grams. The mobile is suspended by a thread 30 cm from the left end. Where should a green triangle with a mass of 20 grams be hung to place the entire system into balance? Please note all possible answers are distances from the LEFT end of the horizontal rod