Question

2 numbers have a difference of 0.7 and a sum of 1. What are the numbers

Answer 1

The two numbers are 0.85 and 0.15

Answer 2

x-y=0.7, x=0.7+y
x+y=1, x=1-y
0.7+y=1-y
2y=1-0.7=0.3
y=0.15
x=0.7+0.15=0.85