Sum number range ignoring numbers formatted as text

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Jul 1, 2015
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I need help summing up numbers in a row that are formatted as numbers, text, and blank cells. For example, A1:A20 will have numbers formatted as text and will also have numbers formatted as numbers.
A1 12:30
A2 2:30
A3 2.00
A4 8:00
A5 10:00
A6 2:00
When I sum these, the answer should be 4 (A3 and A6), instead whole bunch of formulas will add up all of the numbers. Have tried =sum(A1:A20), =sumif(A1:A20, range), =sum(sumif(A1:A20,{">0","<0"})) Please help.
 
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