To solve: the system of equations in two variables.
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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