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Anonymous
1 and 19/20
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-10
-20 -(-5) = -15 ie -(-5) = +5 therefore -20 +5 =15 (two double minuses = a positive)
5, as 20x0.75=15, so 20-15=5
9 - 20 / 4 + 16 = 9 - 5 + 16 = 20
16/20 - 5/20 = 11/20