Two numbers have a difference of 0.85 and a sum of one. what are the numbers?

If you would like to know the numbers, you can calculate this using the following steps:

a - b = 0.85 ... a = 0.85 + b
a + b = 1

a + b = 1
(0.85 + b) + b = 1
0.85 + 2 * b = 1
2 * b = 1 - 0.85
2 * b = 0.15     /2
b = 0.15 / 2
b = 0.075

a = 0.85 + b = 0.85 + 0.075 = 0.925

The correct result would be: 0.075 and 0.925.