Calculate the number 416
NUMBERMANIA: Calculate the number 416 using numbers [2, 3, 9, 5, 70, 268] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.Correct answers: 2
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Cistern cleanersIn 1895, cistern cleaners were patented by black American inventor, R.H. Gray, (No. 537,151). In Aug 1894, he received a patent for a baling press. |