Which two ratios form a proportion? a) 1 2 and 2 7 b) 2 1 and 7 14 c) 1 2 and 7 14 d) 2 1 and 14 21

Julie begins counting backwards from 1000 by 2’s and at the same time tony begins counting forward from 100 by 3’s.   if they count at the same rate, what number will they say at the same time?