Which bacterium is commonly used in genetic engineering

20% of 550 × 25% of 80 = ?² × 22

Evaluate: 96 ÷ {8 + 4 × 2} + 15

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

(³√1728 * 25) ÷ 3 * ? = 250 + 50* 3

33 × ?² – 6 × 5 = 3270

85% of 620 + ? % of 1082 = 4855

?% of (168 ÷ 8 × 20) = 126

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

 (√1296 ÷ √36) × ? = 120

32 of (16/8) of (30/24) of (120/x) = 30

Find the value of the given expression.

[76 – {90 ÷ 5 × (24 – 36 ÷ 3) ÷ 3}]

[∛(91125/19683  )- ∛(3375/5832  )  ] × ∛(512/9261)  = ? - √(484/3969)