Which of the following pairs is not correctly

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

18 × 16 – 11 × 4 = 15² + ?

? + 156 ÷ 3 × 7 = 35% of 400 + (13)²

What value should come in the place of (?) in the following questions?

3(1/2) + 5(1/2) = ? + 4(3/8)

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

√(? - 212) - 84 = 81 - 13 X 9

(42% of 1500 + 170) ÷ 4 = ?² - 5² 

`(256/6561)<sup>(1/4)</sup> = ?`

8 × 12 + 110 ÷ 5 = 7² + ?

(6² - 5² ) % of 800 = 22 X √?

33 × 5 - ?% of 250 = 6² - 6