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Anonymous
It is: 9/10 minus 1/4 = 13/20
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it is 9/20
1/4 minus 9 is -8 3/4 or -8.75
7/10 minus 9/15 is 1/10
negitave 2 10ths
Since LCM(4, 5, 10) = 20, 1/4 - 2/5 - 3/10 = 5/20 - 8/20 - 6/20 = -9/20