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√4096 + √3249 = (?)²

What will come in the place of question mark (?) in the given expression?

(6³ - ?) ÷ 5 + √625 = 19 X (9 - 6)

(1/5)(40% of 800 – 120) = ? × 5

(23 × 8) – (13 × 5) + 67 =? x 6          

If x + y + 3 = 0, then find the value of x³ + y³ – 9xy + 9.

116*2/3% of 18600 + 666*2/3% of 1290 = 457*1/7% of 1750 + 555*5/9% of 3150 + ?

 Solve: 666/6/3 = ?

(8.6 × 8.6 + 4.8 × 4.8 + 17.2 × 4.8) ÷ (8.6² – 4.8² ) = ? ÷ 19

95% of 830 - ? % of 2770 = 650