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"Percent" means "out of" or "over" 100, so put it over "100" and simplify: 78% = 78/100 = 39/50
66/78. Find common factors. They are both divisible by 2,3,6. Divide both by six. 11/13 That is the simplest form.
78/91 u cannot simplify it
180/580 = 18/58 = 9/29
It is: 32 to 39