Find an integer x such that $\frac{2}{3} < \frac{x}{5} < \frac{6}{7}$
4/5, 2/3 = 0.666666... 4/5 = 0.8, 6/7 = 0.857142...
Get a common denominator between 3 5 and 7 = 105
So we have
70 / 105 < 21x / 105 < 90/105
Note that if x = 4 we have that
70 /105 < 84/ 105 < 90 /105
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