1) A rope is 120 feet long. Starting from one end, make a red mark every 3 feet, make a blue mark every 4 feet, and cut the rope at every mark. (Where there’s both a red mark and a blue mark, we only make one cut, not two.) How many pieces of rope do we have now?
To see the answer....note that....in the first 12 feet we make cut at the 3, 4, 6, 8, 9 and 12 foot marks
So...every 12 feet....we have 6 pieces of rope
So....we have (10) (6) = 60 pieces in total