Understanding Mean and Solving for X

The video tutorial explains how to find the unknown value X in a set of numbers where the mean is given. It starts by introducing the problem, setting up the equation, and then solving it step-by-step. The process involves clearing fractions, simplifying the equation, and finally calculating the value of X.

What is the mean of a set of numbers?

• The sum of the numbers divided by the count of numbers

• The smallest number in the set

• The largest number in the set

• The difference between the largest and smallest numbers

If the mean of 24, 21, and X is 20, what equation can be set up to find X?

• 24 + 21 + X = 20

• 24 + 21 + X / 3 = 20

• 24 + 21 + X / 3 = 60

• 24 + 21 + X = 60

What operation is used to clear the fraction in the equation 24 + 21 + X / 3 = 20?

• Subtracting 3 from both sides

• Adding 3 to both sides

• Dividing both sides by 3

• Multiplying both sides by 3

After simplifying the equation, what is the next step to solve for X?

• Subtract 45 from both sides

• Divide both sides by 45

• Add 45 to both sides

• Multiply both sides by 45

What is the value of X when the mean of 24, 21, and X is 20?

• 10

• 20

• 25

• 15