When will the Indian Navy commission stealth frigates

(744 ÷ 6) - (120/5) + 5.5% of 800 = ?²

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

48 X 2.5 + 20% of 150 = ? + 166

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

(1728)^(1/3) + √441 + √1089 = ? × 5 + 11

17.8 + 3/7 of 89.6 = ?

I. 8x² - 74x + 165 = 0

II. 15y² - 38y + 24 = 0

(8² + 6² ) × 1.25 + 20% of 145 = ? – 40% of 65 

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

?% of (175 - 220 + 125) X 24 = 500 - 20 

(115 × 17 × 3)/(23 × 51) + ?³ = √169

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

10% of 80% of 50% of ? = 4