Q:

81 Divided by What Equals 20?

Accepted Solution

A:
81 Divided by What Equals 20? 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 81 by to equal 20? Solving 81 Divided by What Equals 20 Here’s how you would set up this question as an equation: 81 x = 20 \frac{81}{x} = 20 x 81 ​ = 20 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 81: 81 = 20 ∗ x 81 = 20*x 81 = 20 ∗ x Then we can isolate x on the right side of the equation by dividing both sides by 20: 81 20 = x \frac{81}{20} = x 20 81 ​ = 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 = 4.050 x = 4.050 x = 4.050 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 12 equals 16? 55 divided by what equals 2? What is 17/10 divided by 85? What is 12/6 divided by 1/16? What is 80 divided by 7/5?