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4 pounds
12 lb 6 oz - 7 lb 11 0z = 11 lb 22 oz - 7 lb 11 0z = 4 lb 11oz
If the coins in both groups are of the same value 1 kilogram is worth more than double the value of 1 lb. By the way coins are weighed by Troy oz...12 0z to 1 lb. 1 kg = 32.1505 ozt 1 lb = 14.5832224562 ozt. http://www.conversion-metric.org/weight_conversion/kilogram_to_ounce_troy_conversion.php http://www.conversion-metric.org/weight_conversion/pound_to_ounce_troy_conversion.php
11 = (42 - 4) - (4 / 4) 12 = (4 + 4) + (√4 + √4) 13 = (42 - 4) + (4 / 4) 14 = (4 + 4 + 4 + √4) 15 = (4 * 4) - (4 / 4) 16 = (4 + 4 + 4 + 4) 17 = (42 + √4) - (4 / 4) 18 = (42 + 4) - (4 - √4) 19 = (42 + 4) - (4 / 4) 20 = (4 * 4) + (√4 + √4)
Here is one set of solutions. The answers here are not unique. 1 = (4*4)/(4*4) 2 = 4/4 + 4/4 3 = (4+4+4)/4 4 = (4-4)*4 + 4 5 = (4*4 + 4) / 4 6 = 4 + (4+4)/4 7 = 4 + 4 - 4/4 8 = 4 + 4 + 4 - 4 9 = 4 + 4 + 4/4 10 = (44 - 4)/4