The mean of a data set is 50 and the standard deviation

 √256 * 4 – 30% of 190 + ? = 110% of 220

20% of 450 - 15% of 400 = 25% of ?

6612 ÷ 19 - ?% of 240 = -2196

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

64² - 36² = ? X √1225

If 1560 ÷ 30 + 2025 ÷ 45 - z + 33 × 7 = 1848 ÷ 24 × 234 ÷ 39, then the value of z is:

If 3^{2x + 1} – 3^x = 3^{x + 3} – 3², then values of x are:

(54/6) × 5 + 12 × (17/2) = ?% of 700

((9.77)⁰- 〖(0.1)〗^(-1))/(〖(6/2⁴ )〗^(-1) ×(3/2)³+ 〖((-2)/6)〗^(-1) ) = ?

(160 × 12 - 13 × 20)/(120 × 2 + 2 × 35 + 2 × 11) = ?