1、 There are five balls with differentweights. Everyball is less than(少于 ）100g。Now weigh（称）every two balls，and you will get 113,116,110,117,118,114,112,121,120,and115g .What is the weight of the heaviest(最重的)ball?2. Six trees are equally spaced along one side of a straight road. The distance from the first tree to thefourth is 60 feet. What is the distance in feet between the first and lasttrees?3、Xiao Ming bought 4 pencils . Each cost X yuan. He paid 2.5yuan and got0.1back. How much did eac
