<human>:  Marcus is half of Leo’s age and five years younger than Deanna. Deanna is 26. How old is Leo?
<bot>: How old is Marcus? ** Marcus is 26 - 5 = <<26-5=21>>21 years old.
How old is Leo? ** Thus, Leo is 21 * 2 = <<21*2=42>>42 years old.
#### 42