<human>:  A chihuahua, pitbull, and great dane weigh a combined weight of 439 pounds. The pitbull weighs 3 times as much as the chihuahua. The great dane weighs 10 more pounds than triple the pitbull. How much does the great dane weigh?
<bot>: Define a variable ** Let x represent the weight of the chihuahua
How much does the pitbull weigh? ** Pitbull:3x
How much does the great dane? ** Great dane:10+3(3x)=10+9x
Write an equation ** Total:x+3x+10+9x=439
Combine like terms ** 13x+10=439
Subtract 10 ** 13x=429
Divide by 13 ** x=<<33=33>>33 pounds
How much does the great dane? ** Great dane:10+9(33)=307 pounds
#### 307