The sum 10

The sum of the three decimals is 938.629. Two of them are 456.54 and 392.69. Find the third one.

Correct answer:

c =  89.399

Step-by-step explanation:

s=938.629 a=456.54 b=392.69  a+b+c=s  c=sab=938.629456.54392.69=89.399

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