Answer:
2/3
Step-by-step explanation:
The addition is easier if you simplify first:
3/9 + 5/15 = 1/3 + 1/3 = 2/3
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As is, the least common denominator is 45, so the addition can be ...
3/9 +5/15 = 15/45 +15/45 = 30/45 = 2/3
