Ryanne is 7 years older than Hezekiah. Together Ryanne's and Hezekiah's ages equal 15 years. How many years old is Hezekiah?
A step-by-step solution is:
4
Let H = Hezekiah's age.

Ryanne = H + 7.

2H + 7 = 15.

2H = 8.

H = 4.

Hezekiah is 4 years old.

.

Thus, the answer is 4