Make lower part the same i.e. 9 x 5 = 45
So 4 / 9 = 20 / 45
and 2 / 5 = 18 / 45
Then 20 + 18 = 38
Answer: 38 / 45
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4/5 + 3/10 = 8/10 + 3/10 = 11/10 = 11/10
((2 plus (1 over 4)) plus 3) plus (7 over 8) = 6.12500
2 over 3 plus 4 1 over 4 = 59/12 or 411/12
2 & 1 over 4 (2.25)
2/x + 5