All numbers that can range 0.6 from 1.3 can be 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, and 1.9 (or 0.7-1.9). To solve you add and subtract 0.6 to 1.3 and get 0.7 and 1.9. These numbers and all numbers in between are possible solutions. Hope this helps!