# Fraction arithmetic

Algebra Level 1

The sum of $$\frac{1}{2}$$, $$\frac{4}{5}$$, and $$\frac{21}{10}$$ can be written as $$\frac{a}{b}$$, where $$a$$ and $$b$$ are coprime positive integers. What is the value of $$a+b$$?

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