Question

What is the value of $x$ such that $640x$ is divisible by $4$?

• A. $3$
• B. $7$
• C. $4$
• D. $9$

Answer 1

Answer: (C)

$4$

We know the divisibility rule for $4$:
Check the last two digits are a multiple of $4$ or if the last two digits are $0$.
Here, $6,404$ is divisible by $4$ because the last two digits are a multiple of $4$.
So, the value of$x$ is $4.$

So, option C is correct.