90 Divided by What Equals 31?
Methods
Setting up the problem:
In a problem like this, the “what” means that we’re working with a variable. The most common variable used in math is “x”. So we could say what number, x can we divide 90 by to equal 31?
Solving 90 Divided by What Equals 31
Here’s how you would set up this question as an equation:
90
x
=
31
\frac{90}{x} = 31
x 90 = 31
The goal of the problem is to solve for x. To do this we need to change the equation so that x is alone on one side of the equation.In this case, it can be done in two steps. The first step is to multiply both sides by x to isolate 90:
90
=
31
∗
x
90 = 31*x
90 = 31 ∗ x
Then we can isolate x on the right side of the equation by dividing both sides by 31:
90
31
=
x
\frac{90}{31} = x
31 90 = x
When we simplify the new equation, we can solve for x. In this example, we will round to the nearest three decimal places if that’s needed.
x
=
2.903
x = 2.903
x = 2.903
Practice Other Division Problems Like This One
If this problem was a little difficult or you want to practice your skills on another one, give it a go on any one of these too!
What divided by 72 equals 12?
43 divided by what equals 48?
What is 3/14 divided by 24?
What is 18/10 divided by 15/2?
What is 3 divided by 13/6?