The average of two numbers is 40. If one number is 30, what is the other number?

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Q: The average of two numbers is 40. If one number is 30, what is the other number?

Solution: Let the other number be x. (30 + x) / 2 = 40. So, 30 + x = 80. Therefore, x = 50.

Steps: 5

Step 1: Understand that the average of two numbers is found by adding the two numbers together and then dividing by 2.
Step 2: We know the average is 40, so we can write the equation: (30 + x) / 2 = 40.
Step 3: To eliminate the division, multiply both sides of the equation by 2: 30 + x = 80.
Step 4: Now, isolate x by subtracting 30 from both sides: x = 80 - 30.
Step 5: Calculate the result: x = 50.