2/5 plus what equals 3/9?

Here we will show you how to calculate "what" in this sentence: "2/5 plus what equals 3/9?" We start by making this word problem into an algebraic equation where "what" is the variable "x".

2/5 + x = 3/9

To solve this equation, we want x alone on the left side of the equation so we start by subtracting 2/5 on both sides like this:

2/5 - 2/5 + x = 3/9 - 2/5

2/5 - 2/5 + x leaves x and 3/9 - 2/5 is -1/15 which means we end up with x = -1/15. Therefore, the answer to "2/5 plus what equals 3/9?" is as follows:

-1/15

It is always good to double-check your math to make sure you did it right. When we entered -1/15 for x in this equation 2/5 + x = 3/9, we get the following true equation which means our math is correct.

2/5 + -1/15 = 3/9

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