text: help with these math problems? 1. find three consecutive numbers whose sum is 60?  2.the perimeter of a rectangle is 420 in. the width is 4 in. less than the legnth. what is the legnth of the rectangle.   3. find a number which is 150 greater than its opposite.     i would also like to see how you got these answers. thanks in advance. let the numbers be x-1,x and x+1. therefore by the problem x-1+x+x+1=60 =>3x=60 =>x=60/3=20 therefore,the numbers are 19,20 and 21. 2) let the width be x.kthen the length is x+4 the perimetr is 2(x+x+4)=4x+8  =>4x+8=420 4x=412 =>x=412/4=103 therefore width =103 and the length=103+4=107 m (3) let the number be x therefore x=-x+150 =>2x=150 =>x=150/2=75 therefore the number is 75  =>