You are given a math word problem and you are supposed to apply a single mathematical operators like addition, subtraction, multiplication or division on the numbers embedded in the text to answer the following question and then only report final the numerical answer.

Donald has 4 oranges . He finds another 5 . How many oranges does Donald have in all ?
9

There are 22 walnut trees currently in the park . Park workers will plant walnut trees today . When the workers are finished there will be 55 walnut trees in the park . How many walnut trees did the workers plant today ?
33

There are 3 calories in a candy bar . How many calories are there in 5 candy bars ?

15