-344
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You can't subtract a mass minus a pure number. If you mean 1 kilogram minus 345 kilograms, just do the subtraction. If you mean 1 kilogram minus 345 grams, convert the grams to kilograms first (or the kilograms to grams), then subtract.
1kg = 1000g
60 less than 345 = 345 - 60 = 285
Multiply 345 by 15 to get the answer: 345 * 15 = 5175
345 % = 345/100 = 69/20.
It is simply: 345/1 as an improper fraction