Fill in the question mark in the following grid

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Fill in the question mark in the following grid?

8   12  9
10  7   20
3   10  ??

posted Oct 28, 2015 by anonymous

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1 Answer (Check Answer ▼)

8 12 9
10 7 20
3 10 ?
8+10+3=21
12+7+10=29=21+8
9+20+?=21+2*8--> ?=8

answer Jul 29, 2018 by Hanifa Mammadov

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