My 1st "let" statement is usually associated with the variable that's being sought. In other words, here I would say, "Let Charles' age be C."

But, this would involve FRACTIONS, and that's a topic that most would rather stay away from, you included, I'd assume! So, I'll go with Nina.



Let Nina's age be N

Then Charles' is 4N

We then get: 4N - 8 = 10(N - 8)

4N - 8 = 10N - 80 

4N - 40N = - 80 + 8

- 6N = - 72

N, or Nina's age is: 

Therefore, Charles is:  

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