First make the lower parts of the fraction the same,
so as 10 and 25 both go into 50, then
3/10 = 15/50 and
9/25 = 18/50 then
15+18= 33
Answer: 33/50
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twelve and nine tenths/one hundred and twenty nine over ten/12.9
Nine tenths plus two fifths minus one fourth is equal to 1.05
nine fifths 18/10 = 9/10 + 9/10 18/10 = 9/5
3.8 + 2.9 = 6.7
The sum of 9/10 and 3/5 is 1 1/2 or 1.5