To find the weight of Gabriel's pumpkin, we need to add the weight of Marcos' pumpkin and the additional weight that Gabriel's pumpkin has.
Marcos' pumpkin weighs 1.37 pounds.
Gabriel's pumpkin weighs 0.24 pounds more than Marcos' pumpkin:
\[ \text{Weight of Gabriel's pumpkin} = \text{Weight of Marcos' pumpkin} + 0.24 \]
Substituting the values:
\[ \text{Weight of Gabriel's pumpkin} = 1.37 + 0.24 \]
Performing the addition:
\[ 1.37 + 0.24 = 1.61 \]
Thus, Gabriel's pumpkin weighs 1.61 pounds.