A classroom has students from two different grades. There are 15 students from Grade 5 and 10 students from Grade 6. Each student from Grade 5 has 2 pencils, and each student from Grade 6 has 3 pencils. If the teacher wants to give enough pencils so that every student has the same number of pencils, how many pencils does the teacher need to give away in total? Let's think step by step and output the final answer within \boxed{}.
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