According 5819

According to the sowing plan, sugar beet and grain are to be sown on an area of ​​840 ha. The area sown with sugar beet should be three times larger than the area sown with grain. What area should the grain be on?

Correct answer:

o =  210 ha

Step-by-step explanation:


r+o= 840
r = 3o

r+o= 840
r = 3·o

o+r = 840
3o-r = 0

Pivot: Row 1 ↔ Row 2
3o-r = 0
o+r = 840

Row 2 - 1/3 · Row 1 → Row 2
3o-r = 0
1.33r = 840


r = 840/1.33333333 = 630
o = 0+r/3 = 0+630/3 = 210

o = 210
r = 630

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