I converted 13% to 0.13 but I do not know how to solve this problem.
Tagged 35 seals. Recaptured, 15 percent tagged. Estimate total number of seals.
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15% of the total = 35 (by the way "of" almost always means multiply)
let t be the total
.15 t = 35
divide by .15 to get t by itself
35/.15 = 233.33333
Thus the total number of seals is about 233.
I think this means that 15% is 35.
So 15/100 * X = 35
where X = total number of seals.
15 * X = 3500
X = 234
This is my assumption from the provided info. If not, please provide with a rephrased problem.