15.3 (decimal used)
wait...
did you mean 3/10 + 3/5?
In that case, it is 9/10 :)
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1/5 + 3/10 =2/10 + 3/10 = 5/10 = ½
4
3/5
To add 6 tenths and 3 thousandths, convert them to the same decimal format. 6 tenths is 0.600, and 3 thousandths is 0.003. Adding these together gives 0.600 + 0.003 = 0.603. Thus, 6 tenths plus 3 thousandths equals 0.603.
19-30ths