Question

find two decimal fractions whose sum is 1 and the difference is 0.5

Answer 1

We can make two regulations like a+b=1 and a-b=0.5.and solve it

Answer 2

let the numbers be a and b
a+b=1. (i)
a-b=0.5 (ii)
by adding (i) and (ii),we get
a+b=1
a-b=0.5
----------------
2a=1.5
a=1.5/2 =0.75
by putting value of a in (i)
a+b=1
0.75+b=1
b=1-0.75=0.25