x³ + y³+ z³ - 3xyz = (x+y+z)× 1/2 [3( x² + y² + z²) - (x + y + z)2] => 842 - 3xyz = 7× 1/2 [3 × 85 - 49] => 842 - 3xyz = 7× 103 => 3xyz = 842 - 721 => 3xyz = 121 =>√3 xyz = √121 = 11
(1011 × 4.465 + 1012 × 0.3535) ÷ (160 × 10⁵) = 10? ÷ 2
...(51.99² - 19.05² )÷ ? = 14.11² - 140.33
? × [(16.87) 2 – (6.98) 2 ] = 5.04× 191.11
12, 16, ?, 36, 52, 72
(16.16 × 31.98) + 24.15% of 649.99 = ? + 124.34
[(2/3 of 899.79) + 25% of 500.21] × (√195.77 + 30.03% of 399.79) = ?
3.992 + (3.01 × 2.98) + ? = 225.03
440.11 ÷ 21.98 × 5.14 – 72.9 = √?
{16.11 x 9.96 - (238.19 - 64.04 x 2.18)} = ?
Find the difference of day had the highest number of books and that of lowest number of books sold?
