You are given a math word problem and you are supposed to apply multiple mathematical operators 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.

a waiter at 'the greasy spoon ' restaurant had 39 customers to wait on . during the lunch rush he added another 12 customers . if 49 of the customers did n't leave him a tip how many customers did leave a tip ?
2

a store had 87 coloring books in stock . they ended up putting them on sale and getting rid of 33 of them . the put the 1 they still had onto shelves with 6 on each shelf . how many shelves did they use ?
9

after the aviary was the zoo 's swamp area . penny counted a total of 55 tree frogs 10 poison frogs and 13 wood frogs . how many frogs was penny able to count ?

78

