Count the boxes

Algebra Level 2

Boxes are stacked in a factory using a pattern. One box stays on two boxes and those two stays endured by three boxes and so on. An experienced employee knows that to get the total of boxes stacked is just count the number of boxes on the base of the stack and make some calculations. If the number of boxes stacked was 210, how many boxes on the base of the stacking?

20 -21 30 10

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