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Anonymous
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109 you can plus like this: (19+1)+20+20+(1+1+18)+4+25
7/20 + 9/10 = 7/20 + 18/20 = 25/20 = 5/4
Solution: 20+25=? 20x.2=4 20+4=24 ans.
LCD(25, 20, 4) = 100.
25/20. Divide both top and bottom by 5.5/4 or 1 and 1/4