What kind of word problem is this

Question

Jenny is 13 years older than her sister Myra. Myra is 6 Years younger than her sister Melody. Their combined ages equal 88 years. How old is Myra?

I wanna study more problems like this for my ASVAB but i don't know what kind of math it is.

Answer 1

We can say Jenny's age = Myra's age + 13

Myra's age = Melody's age - 6, which can also be written to say that Melody's age = Myra's age + 6

Now, let m = Myra's age

Then Jenny's age = m + 13, and Melody's age = m + 6

If their combined ages have a sum of 88, then we can form the equation:

(m + 13) + m + (m + 6) = 88

3m + 19 = 88

3m = 69

m = 23 = Myra's age