4/7 plus what equals 2/5?

Here we will show you how to calculate "what" in this sentence: "4/7 plus what equals 2/5?" We start by making this word problem into an algebraic equation where "what" is the variable "x".

4/7 + x = 2/5

To solve this equation, we want x alone on the left side of the equation so we start by subtracting 4/7 on both sides like this:

4/7 - 4/7 + x = 2/5 - 4/7

4/7 - 4/7 + x leaves x and 2/5 - 4/7 is -6/35 which means we end up with x = -6/35. Therefore, the answer to "4/7 plus what equals 2/5?" is as follows:

-6/35

It is always good to double-check your math to make sure you did it right. When we entered -6/35 for x in this equation 4/7 + x = 2/5, we get the following true equation which means our math is correct.

4/7 + -6/35 = 2/5

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