2+5:10

The expression "2 + 5:10" is ambiguous due to the colon. Could you clarify what you mean by "5:10"?

If you're looking at the ratio 5:10, it can be simplified to 1:2.

If you're asking for the arithmetic operation, please specify. For example, if you're looking at "2 + 5" divided by "10," that would be calculated as follows:

\[ \frac{(2 + 5)}{10} = \frac{7}{10} = 0.7 \]

Please provide more context so I can assist you better!