No, not generally. Sometimes you may by chance (to a degree) find the exact number. Estimations are put in place to give us a rough guide to for instance experimental data.
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Estimation is 40, which is 1/3 of 120. Actual answer is 39.27
Early estimation can help give an indication of the answer.
estimation
Estimate: 40+20 = 60 Actual: 38+23 = 61
60/3 = 20