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.
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Question: professor treehead of the flora university requested his students to participate . he said that they planted 15 species of trees in the natural park 20 species of trees in the neighboring forest and 10 species of trees all around different locations in town . how many species of trees were planted by the students ?

Answer: 45

Question: mr. peter harvested some pears . he picked 43 kg of the pears into a bag and 35 kg of the pears into another bag . if there were still 15 kg of pears left unpacked how many kilograms of pears did mr. peter harvest ?

Answer: 93

Question: roger had 63 dollars . if he spent 48 bucks on a new game how many 3 dollar toys could he buy with the money he had left ?

Answer:
5