The number of boxes that Sarah and Imelda have sold are both being compared to that of Keiko.

So, let's assign a variable to the number of boxes sold y Keiko. Let it be x.

Since the numbers of boxes that Sarah has sold is *43 fewer than x*,
to express this in math form, subtract 43 from x. It will be:

`x-43`

Also, since the number of boxes sold by Imelda is 53 more than x, then we add 53 and x. So, it will be:

`x+53`

**Hence, the algebraic expressions of each relations are:**

**# of boxes sold by Keiko = x**

**# of boxes sold by Sarah = x - 43
and**

**# of boxes sold by Imelda = x + 53 . **

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