The Sum Of Two Numbers Is 77 And Their Difference Is 1

The problem given says that 2 unknown numbers are given, whose sum is equal to 77 and the difference is 1. Let's find the two numbers :

When we add the two numbers :
X + Y = 77

The difference of two numbers :
X - Y = 1

Solution :

If we add the two equations eachother , then we can find the first number.

X + Y = 77
X - Y = 1

2X = 78

Let's divide 78 to 2 for the first number "X" .

X/2 = 39

First number is 39

X + Y = 77
So ;
39 + Y = 77
Y = 77 - 39
Y = 38

Second number is 38

Question & Answer
The Sum Of Two Numbers Is 77 And Their Difference Is 1 : 39 And 38