Oh, dude, the ratio of 210 to 140 is like 3:2. It's just a fancy way of saying if you have 210 things, you'd have 3 times as many as if you had 140 things. But like, who's counting, right?
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It is: 140+70 = 210
It is 2 over 3.
It is: 840
3 to 7.
Some of the multiples of 70 are: 70, 140, 210, 280, 350, 420, etc. (The list is infinite.)