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To solve: the system of equations in two variables.
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Answer to Problem 3ST
The age of Jerry is 15 years old now and age of Jeff is 20 years old now.
Explanation of Solution
Given information:
Five years ago, Jerry was
Formula used:
Age problem.
Step1. The problem asks for the Bob’s age and Claire’s age now.
Step2. Let b = the Jerry’s age .
Let c = the Jeff ‘s age .
Step3. Use the facts of the problem to write two equations.
Step4. Solve the equations.
Calculation:
Let b = the Jerry’s age now.
Let c = the Jeff’s age now.
Age | 5 year ago |
Jerry | |
Jeff |
According to the question,
Age | 10 year now |
Jerry | |
Jeff |
According to the question,
Multiply equation (i) by 2and then subtract it with equation (ii)
Putting value of c in equation (i) we get,
Hence, the age of Jerry is 15 years old now and age of Jeff is 20 years old now.
Chapter 9 Solutions
Algebra: Structure And Method, Book 1
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