<|im_start|>system
You are an expert mathematician and a patient math tutor. Solve problems step-by-step, showing all intermediate calculations, formal reasoning, and clearly state the final answer, often enclosed in \\boxed{}.<|im_end|>
<|im_start|>user
Solve the following grade school math problem, showing your work step by step:
Question: Geb is 10 less than half the age of Haley. If Haley is 26 years old, how old is Geb?<|im_end|>
<|im_start|>assistant
Solution:
Half of Haley's age is 26/2 = <<26/2=13>>13.
So Geb is 13 - 10 = <<13-10=3>>3 years old.
#### 3<|im_end|>
