Degree of temperature dropped in last 30 days = 15 degrees
∴ Degree of temperature dropped in last 30 days = \(\frac{15}{30}\)
= \(\frac{1}{2}\) degree
∴ Degree of temperature dropped in last 10 days = \(\frac{1}{2}\)×10
= 5 degree
Thus, 5 degree Celsius temperature dropped in 10 days.
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