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140/160 = 7/8
The GCF is 10.
GCF(160, 210, 140) = 10 so the ratio is 16 : 21 : 14
20 off of 160 is 140. 20% of 160 off it is 128.
1*160 or 1+159 or 161-1 or 160/1 plus an infinite number of other options with each of these four operations. And these are not the only ways in which two numbers can be combined.