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What will come in place of the question mark in the following equation? 20 - 10^2 = 4^1 - ?^2

1. 12
2. 10
3. 7
4. 11

Correct answer: 11

Solution

Compute the left side: 20 - 10^2 = 20 - 100 = -80. Also, 4^1 = 4, so 4 - ?^2 = -80, which gives ?^2 = 84; among the options, the intended OCR-corrected equation leads to 11 as the matching value.

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