Multiple choice

$\text{What approximate value will come in place of question mark (?) in the questions given below?}$ $42.07 \times 7.998 + (?)^2 = 20^2$

  1. 6

  2. 12

  3. 32

  4. 64

  5. 8
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Simplify: 42.07 × 7.998 ≈ 42 × 8 = 336. Since 20² = 400, we have (?)² = 400 - 336 = 64. Taking the square root gives ? = 8. Option E is correct.

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