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Range: Find the missing number

Lucas has the following data:

 y   5  5  7  8  9  10  10

If the range is 7, which number could y be?

The range is the difference between the greatest number and the least number.
Let the minimum of the data set be = y
Then because Range = Maximum - Minimum
7 = 10 - y
y = 10 - 7
= 3 (which is the minimum of the data set)