When is the US Coast Guard Day celebrated?

The valueof2 of5– 1/2 −[4÷2– 1/3 −{3/4−(5– 1/2 – 3/4 )}]is :

25.6% of 250 + √? = 119     

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

(28/14) of 56 + ? = 920 ÷ 5

15 * 12 + 35% of 80 + 70% of 130 = ?

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

(17/27) of 162 + ?² = 632 - (73 - 12) X 5

√? = 32% of 900 + 48% of 50

(5⁴) ⁵ × (25³)³=?

625 × (?% ÷ 125) = 250% of 10

18(1/3) + 9(2/3) – 10(1/3) = 1(2/3) + ?

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

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