Planting Corn & Soybean

Algebra Level 2

3 + x 120 3+\frac{x}{120} 3 + x 30 3+\frac{x}{30} 3 + x 40 3+\frac{x}{40} 3 + 7 x 120 3+\frac{7x}{120}

Kumar Gupta by Kumar Gupta , 23, India

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4 solutions

Tanya Gupta
Feb 22, 2014

Simple option substitution....if x=120,y=0 and the man should take 4 days to completely cover the field with corn.....if some1 cums up with the actual solution do post it!!

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Tootie Frootie
Feb 20, 2014

bcoz 30 of course .....

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x + y = 120; Let T be the total time, T = (x/30)+(y/40); T = (x/30) + ((120-x)/40); T = 3 + x/30 - x/40 => T = 3 + x/120

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Shweta Rai
Feb 28, 2014

rate of planting corn is 3/4 times of that of planting soy . so,if he plants x acres of corn in let say z days then he will plant 4/3 x acres of soy in z days , 30z+40z=x+y => z=(x+y)/70 =>x/30 (as y=4/3 x)

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