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CCSS Support Math II 3.5.13 Example 3

Monique and Nestor are planting seeds in a garden. They each started with an identical packet of seeds. Monique has used seeds from her packet and has 30 seeds left, while Nestor has used seeds from his packet and has 40 seeds left. The combined number of packets of seeds Monique and Nestor have used can be represented by the rational expression . What is the least common denominator of the terms of the expression?