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Question:

A gardener is preparing to plant seeds in his newly prepared garden. Before he plants the seeds, he wants to test his soil's acidity. He does this by testing the pH level, which he discovers is 10. The neighbor's soil has a pH level of 11. The neighbor's soil is how many times more basic than the gardener's soil?

A 10 times
Explaination

With each successive number in the pH scale, the base/acid levels are increased or decreased 10 times. For example, a reading of 8 is 10 times more basic than 7, and a reading of 4 is 10 times more acidic than 5.