Below is an instruction that describes a task. Write a response that appropriately completes the request in English. Please answer in English.

### Instruction:
The ratio representing the age of Halima, Beckham, and Michelle is 4:3:7, respectively. If the total age for the three siblings is 126, calculate the age difference between Halima and Beckham.

### Response:
The total ratio representing the age of the three siblings is 4+3+7 = <<4+3+7=14>>14
Halima's age is represented by the fraction 4/14, which means she is 4/14*126 = 36 years old.
Beckham's total age is 3/14*126 = <<3/14*126=27>>27 years since the age ratio representing him is 3.
The difference in age between Halima and Beckham is 36-27 = <<36-27=9>>9
#### 9