0
Anonymous
Because your calculator is broken.
Seriously; 30 divided by half (0.5) is 60 and 60 + 10 = 70
So, 30 cut in half (30/2) is 15 but 30 DIVIDED BY half (30/0.5) is 60.
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10
-10
2 divided by 10 is 0.2
0.371
18