Q:

40 Divided by What Equals 81?

Accepted Solution

A:
40 Divided by What Equals 81? 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 40 by to equal 81? Solving 40 Divided by What Equals 81 Here’s how you would set up this question as an equation: 40 x = 81 \frac{40}{x} = 81 x 40 ​ = 81 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 40: 40 = 81 ∗ x 40 = 81*x 40 = 81 ∗ x Then we can isolate x on the right side of the equation by dividing both sides by 81: 40 81 = x \frac{40}{81} = x 81 40 ​ = 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 = 0.494 x = 0.494 x = 0.494 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 45 equals 53? 74 divided by what equals 8? What is 5/20 divided by 50? What is 14/15 divided by 2/7? What is 34 divided by 18/8?