48
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7 hours subtracted by 30 minutes = -23
1980 subtracted by 2010 = -30
(X - 30) does.
If you mean 30% of 78 then it is 23.4
78 30 x 2.6 = 78 CHECK: 100% of 30 = 30 200% of 30 = 60 10% of 30 = 3 60% of 30 = 18 200% + 60% = 60 + 18 = 78 Simply divide 30 by 100, to find 1% and then multiply by 260, to find 260%, which is 78