Number Grid: Which Number Is Missing?
Number Grid
Number Grid. Numbers are arranged in a grid pattern. One number is missing. Find the value that completes the grid.
Community Solutions (2)
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Official
Each row doubles from left to right:
4 → 8 → 16
5 → 10 → 20
6 → 12 → 24
Answer: 24
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Official
24.
The rows are a geometric progression, where each cell is multiplied by 2. As seen by 5 -> 10 -> 20 and 4 -> 8 -> 16. So the last row should have 12*2 = 24.
The columns are an arithmetic progression, where each cell is increased by the same amount: 1 in the first column, 2 for the second column. We observe that 20-16 = 4, so we expect the answer to be 20+4 = 24.
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