What was the ancient name of

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

128 + 16 X 6 - ? = 88 + 4 X 26 

13 X √? + 256 ÷ 4 = 30% of 900 - 50

192.251 + 326.233 + 125.021 + 19.273 = ?

(560 ÷ 32) × (720 ÷ 48) = ?

√256 × 25 – 15 × 14 =?

? % of 1200 = 20% of 30% of 3600

Find the simplified value of the given expression:

(12 ÷ 3 of 2 + 11 of 2) ÷ 4

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

25% of 1280 + (41 × 4) = ?²