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What should come in place of question mark (?) in the following question? 52000 ÷ 40 ÷ 65 × 30 = ? - √400

580
620
720
780

Correct Answer: 620

Explanation:

52000 ÷ 40 ÷ 65 × 30 = ? - √400

(52000 ÷ 40) ÷ 65 × 30 = ? - 20

(1300 ÷ 65) × 30 = ? - 20

20 × 30 = ? - 20

600 = ? - 20

? = 620

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