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If the average of two numbers is 30 and one of the numbers is 20, what is the ot
If the average of two numbers is 30 and one of the numbers is 20, what is the other number?
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Practice Questions
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Q1
If the average of two numbers is 30 and one of the numbers is 20, what is the other number?
10
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40
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Let the two numbers be a and b. (a + b) / 2 = 30. If a = 20, then 20 + b = 60, hence b = 40.
Questions & Step-by-step Solutions
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Q
Q: If the average of two numbers is 30 and one of the numbers is 20, what is the other number?
Solution:
Let the two numbers be a and b. (a + b) / 2 = 30. If a = 20, then 20 + b = 60, hence b = 40.
Steps: 6
Show Steps
Step 1: Understand that the average of two numbers is found by adding them together and dividing by 2.
Step 2: Write the formula for the average: (a + b) / 2 = 30.
Step 3: Multiply both sides of the equation by 2 to eliminate the division: a + b = 60.
Step 4: We know one of the numbers (a) is 20, so substitute 20 for a in the equation: 20 + b = 60.
Step 5: To find b, subtract 20 from both sides of the equation: b = 60 - 20.
Step 6: Calculate the result: b = 40.
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