It can be noted that the decimals that fit into the equation will be 68.05, 68.3, and 68.006.
Your information is incomplete as the original equation isn't given. Therefore, an overview will be given.
Let's assume that the statement is that you should find three decimals where the addition equals 204.086
In this case, you've to look at the decimals and add the three that will give the number above. In this case, the three decimals will be:
68.05 + 68.3 + 68.006
= 204.086
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