Direction (Q. 1 - 10): What will come in place of the question mark (?) in the following questions?

13⁷ x 13^? / 13¹¹ = 1

12 5/9 + 5 2/3 - ? = 11 1/9

7968-5249 + ? - 2133 = 4047

56% of 250 + 25% of 280 = ?% of 525

14.5 × 1.2 ÷ 0.5 =? 

3/7 of 2 1/3 of ? of 2 3/4 of 568 = 284

17 x 2 - 46 ÷ 10² / √27 √? = 9

45% of 35 + 225 = ? % of 75

√256 √16 ÷ ? = 16

20.40 × ? = 12.24