A botanist is monitoring the growth of a certain plant. She recorded the number of leaves and flowers of the plant with respect to time, which is shown in the following tables.

From the \(11^{th}\) week, the leaves of the plant start falling, meanwhile the plant starts blooming. Assume the plant's leaf-falling and flower-blooming are at two fixed rates, respectively. On the \(m^{th}\) week, all the leaves have fallen.

Source clarification: the first rule gives 99 leaves at week 10, while the second table starts at 120 leaves in week 11. Treat week 11 as the starting observation for the later model; the tabulated fall of 10 leaves per week begins after that observation.
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