The sum of two numbers is 80 and their difference is 20. What are the two numbers?
- 50,30
- 50,40
- 60.20
- None
Explanation
Let's start by calling the two numbers we are looking for x and y.
x + y = 80
x - y = 20
x - y = 20
x = 20 + y
x + y = 80
20 + y + y = 80
20 + 2y = 80
2y = 60
y = 30
x + y = 80
x + 30 = 80
X = 50
Sum: 50 + 30 = 80
Difference: 50 - 30 = 20
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