Here we will show you how to calculate "what" in this sentence: "What plus 3/4 equals 2/5?" We start by making this word problem into an algebraic equation where "what" is the variable "x".

x + 3/4 = 2/5

To solve this equation, we want x alone on the left side of the equation so we start by subtracting 3/4 on both sides like this:

x + 3/4 - 3/4 = 2/5 - 3/4

x + 3/4 - 3/4 leaves x and 2/5 - 3/4 is -7/20 which means we end up with x = -7/20. Therefore, the answer to "What plus 3/4 equals 2/5?" is as follows:

**-7/20**

It is always good to double-check your math to make sure you did it right. When we entered -7/20 for x in this equation x + 3/4 = 2/5, we get the following true equation which means our math is correct.

-7/20 + 3/4 = 2/5

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