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

### Instruction:
 Jamestown has 20 theme parks. If Venice has 25 more theme parks than Jamestown, and Marina Del Ray has 50 more theme parks than Jamestown, calculate the number of theme parks present in the three towns.


### Response:
 Étant donné que Venise a 25 parcs à thème de plus que Jamestown, il y a 20+25 = <<20+25=45>>45 parcs à thème à Venise.
Avec 50 parcs à thème de plus que Jamestown, Marina Del Ray a 20+50 = <<20+50=70>>70 parcs à thème.
Au total, les trois villes ont 20+45+70 = <<20+45+70=135>>135 parcs à thème.