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

[Q]: her last stop was the post office . there she sent her rock collection to the geological museum in london . she was left with her 15 favorite stones after sending away a part of her collection . if she originally has 78 stones in her collection how many did she send away ?
[A]: 63

[Q]: mrs. hilt saw 21 snakes 11 alligators 36 frogs and 57 bears . how many reptiles did mrs. hilt see ?
[A]: 32

[Q]: when the building is done they wanted to make it shine brightly in the night . to fix that they commissioned 432 fireflies and 297 glow worms . how many animals worked in the lights ?
[A]:
729