Answer:
It seems to me that they did the addition of 10.137+58.2 instead of 10.137+5.82. Notice the difference between 58.2 and 5.82, the decimal is moved to the right 1 in 58.2. The correct answer is 10.137+5.82=10+5+0.137+0.82=15+0.952= 15.952
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