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Can anyone help me do #15 ​

Can anyone help me do #15 ​-example-1

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She \: tilled \: over \: 2 \: days: 7(2)/(12) + 4 (11)/(12) = 12 (1)/(2) < 15 (7)/(12) \\ \Rightarrow She \: didn't \: till \: enough \: soils, \: she \: need \: 15 (7)/(12) - 12 (1)/(12) = 3 (1)/(2) \: yards \: of \: soils \: more

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