Jennifer is twice as old as Peter. The difference between their ages is 15. What is Peters age

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Jennifer is twice as old as Peter. The difference between their ages is 15. What is Peters age

Let j be Jennifer's age
Let p be Peter's age

We're given two equations:

1. j = 2p
2. j - p = 15

Substitute equation (1) into equation (2) for j
2p - p = 15

To solve for p, we type this equation into our calculation engine and we get:
p = 15