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

### Instruction:
The age of Gladys is equal to twice the sum of the ages of Billy and Lucas. Billy is 3 times younger than Gladys who is 30 years old now. How old will Lucas be three years from now?

### Response:
Billy's age is 30/3 = <<30/3=10>>10 years old.
The sum of the ages of Billy and Lucas is 30/2 = <<30/2=15>>15.
So, Lucas is 15 - 10 = <<15-10=5>>5 years old now.
Three years from now, Lucas will be 5 + 3 = 8 years old.
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