In what year has the United Nations designated the

25.31% of 5199.90 + (19.9 × 17.11) + 46.021 =? + 168.98

1560.182 ÷ √168 + √143 * √224 – 4649.87 ÷ 30.883= ?        

1242.12 ÷ √530 + 1139.89 ÷ 14.91 = ? + 45.39

[(2/3 of 899.79) + 25% of 500.21] × (√195.77 + 30.03% of 399.79) = ?

416.021 ÷ 3.782 + 13.012 × 24.987 =?

√31684.11 × √728.9 – (19.02)² = ? × 4.99 

12.03 x 4.21 +19.95% of 300.05 =  ?

58.03% of 1499.99 - ? % of 699.95 = 394.04

Solve the given equation for ?. Find the approximate value.

(3/5 of 399.78 + 7/9 of 360.15) ÷ (√63.94 + 25% of 383.94) = ?

1299.999 ÷ 325.018 × 24.996 = ?