Question

38 plus what number equals 40? 38 + 15 = ? (with a pentagon image and a boxed area under the number 15 split into two parts)

Explanation:

Step1: Define unknown variable

Let the unknown number be $x$.

Step2: Set up equation

$38 + x = 40$

Step3: Solve for $x$

$x = 40 - 38$
$x = 2$

Answer:

$2$