Answer:
His estimate is reasonable
Explanation:
1/10 + 6/10 = 7/10, which can be rounded to 1
1/10, 2/10, 3/10, 4/10, 5/10, 6/10, 7/10, 8/10, 9/10, 1
As you can see, 7/10 is very close to 1.
Hope this helps!
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