Multiple choice

What approximate value should come at place of question mark (?) in the following questions?(74^2 - 29^2 = ?\%\ of\ 750)

  1. 620

  2. 690

  3. 760

  4. 590

  5. 730
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Calculate LHS: 74² - 29² = (74 - 29)(74 + 29) = 45 × 103 = 4635 using difference of squares formula. Now find what percent of 750 equals 4635: (4635/750) × 100 = 6.18 × 100 = 618%. Option A (620) is the closest approximation.

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