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To find an equivalent ratio, we need to find a common multiple of both the numerator and the denominator. In this case, a common multiple of 9 and 78 is 3.
To find the equivalent ratio, we divide both the numerator and the denominator of 9/78 by 3:
9 รท 3 = 3
78 รท 3 = 26
Therefore, the equivalent ratio is 3/26.
So, the correct answer is:
3/26