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It is si very simple to get the answer using your calculator: it is 5.983
If combining digits to form 2-digit numbers is allowed then some solutions are :- 21 + 3 - 5 = 19 23 + 1 - 5 = 19
As a solution to the four fours problem (using the number four no more than four times to come up with the solution, 31 is equal to (4!+4)/4+4!
28
The answer to this equation would equal 4.8. This is a math problem.