Question
(18.21)² - (12.9)² = 20% of 649.9 - ? +
400.033 What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value)Solution
(18.21)² - (12.9)² = 20% of 649.9 - ? + 400.033 => (18)² - (13)² = 20% of 650 - ? + 400 => 324 - 169 = 130 - ? + 400 => ? = 530 – 155 => ? = 375
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