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?
Billy's age is 30/3 = 
<gadget id="calculator">30/3</gadget>
<output>10</output>
10 years old.
The sum of the ages of Billy and Lucas is 30/2 = 
<gadget id="calculator">30/2</gadget>
<output>15</output>
15.
So, Lucas is 15 - 10 = 
<gadget id="calculator">15-10</gadget>
<output>5</output>
5 years old now.
Therefore, Lucas will be 5 + 3 = 
<gadget id="calculator">5+3</gadget>
<output>8</output>
8 years old three years from now.

<result>8</result>