It is 10 - 3*n where n is the number.
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it means an increase or decrease by 10 times.
to triple a number that was decreased by five you subtract 5 and then multiply by three. for example if you where given 10 you would 12-5=7 -> 7*3=21
40% decrease.
Multiply 10 by any number except zero, then divide 10 by the same number. The geometric mean of those two numbers will be 10.
(Sum of terms)/(number of terms) (10+10+10+2)/4=8