The optimum soil ph for growing strawberries is 6.5, whereas the optimum soil ph for growing blueberries is 4.5. therefore, the number of hydrogen ions needed to grow strawberries is times the number needed for blueberries.

The right answer is: a hundred (100)

You can figure it out by comparing the Hydrogen concentration of both pH:
to convert pH into hydrogen concentration : (H+) (mol/L) = 10^-pH

Let's compare the pH of the two soils using a ratio:

Ratio =  = = 100

You should note that between every pH unit there's a ratio of 10 between them (since pH is a logarithmic value)

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