Question

\\2 \times 5 \times 4 = (2 \times \box) \times 4\\
\\= \box \times 4\\
\\= 40\\

Explanation:

Identify the missing value in the first blank

$$ 2 \times 5 \times 4 = (2 \times \square) \times 4 \implies \square = 5 $$

Calculate the product inside the parentheses for the second blank

$$ (2 \times 5) \times 4 = \square \times 4 \implies 10 \times 4 $$

Verify the final product

$$ 10 \times 4 = 40 $$

Answer:

$$
LATEXBLOCK0
$$