What is the sum of all positive integers r that satisfy
lcm [ r, 700 ] = 3500
r = 125, 250, 500, 875. Sum = [125 + 250 + 500 + 875] =1,750
r =125, 250, 500, 875, 1,750, 3,500
Sum =[125 + 250 + 500 + 875 + 1,750 + 3,500] =7,000
