It is 0.825
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0.2
0.075
If you mean 6/40 then as a decimal it is 0.15
Expressed as a decimal, 10/33 is equal to 0.30 recurring (that is, 0.303030...)
5/8th + 8/5th is easier to work out if they are converted to the same fractions, they can both easily be converted to 40ths. 5/8th = 25/40ths 8/5ths = 64/40ths. So 25/40ths + 64/40ths = 89/40ths, which is 2 and 9/40ths.