Struggled with remainder question under prep swift's deduction

Stuck with the following as well

I can’t figure out gif we get x =4k + 3.

What I originally did was the easiest way to deduce x is when x=3 which leads to remainder 8. Therefore, 3/4 will leave a remainder 3 > 2 of Quantity A.

Let’s start by making some deductions.

When something is divided by 10 and the remainder is 8, what does that tell you?

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