$\"\"$ $\"\"$

The expression is “two fifths of a number equals $\"\"$ ”.

Let $\"\"$ represent the number.

The word “equals” can be represented as “ $\"\"$ ” symbol. $\"\"$

Rewrite the sentence into expression as

$\"\"$

The equation is $\"\"$ $\"\"$

According to multiplication property of equality:

Multiply each side by $\"\"$ , the reciprocal of $\"\"$ .

$\"\"$

$\"\"$ (Cancel common terms)

$\"\"$ (Multiply: $\"\"$ ) $\"\"$

The number is $\"\"$ .