Question

2.8 plus what number equals 3?
2.8 + 1.5 = ?

Explanation:

Step1: Define unknown variable

Let $x$ be the unknown number.

Step2: Set up equation

$2.8 + x = 3$

Step3: Solve for x

$x = 3 - 2.8$
$x = 0.2$

Step4: Calculate 2.8 + 1.5

$2.8 + 1.5 = 4.3$

Answer:

The number that makes 2.8 equal 3 when added is 0.2.
$2.8 + 1.5 = 4.3$