IBPS PO General Awareness: Algebra questions with solutions

Q1. 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

Answer: 11

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.