How to determine the whole number when given the part and percent

The video tutorial explains how to solve percentage problems using proportions. It begins with an introduction to the concept of percentages and proportions, followed by setting up a proportion to solve a specific problem: finding what number 18 is 40% of. The tutorial then demonstrates solving the proportion by dividing and using long division to find the unknown value, which is 45. The explanation includes detailed steps and encourages understanding of the process for future problems.

What is the basic formula used to solve percentage problems?

• Whole - Part = Percentage

• Part + Whole = Percentage

• Whole/Part = 100/Percentage

• Part/Whole = Percentage/100

In the problem '18 is 40% of what number?', what does the number 18 represent?

• The percentage

• The part

• The divisor

• The whole number

When setting up the equation for '18 is 40% of what number?', which variable represents the whole number?

• W

• X

• Y

• Z

What is the first step in solving the equation 40Y = 1800?

• Add 40 to both sides

• Subtract 40 from both sides

• Divide both sides by 40

• Multiply both sides by 40

How many times does 40 go into 180 during the long division process?

• 6 times

• 5 times

• 4 times

• 3 times