Find two positive numbers x and y such that
x+y=28 and xy is maximum.

Explanation

To solve the problem of finding two positive numbers \( x \) and \( y \) such that \( x + y = 28 \) and the product \( xy \) is maximized, we can follow these steps:

### Step 1: Set up the equations
We are given the equation:
\[ x + y = 28 \]
From this, we can express \( y \) in terms of \( x \):
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