Circumference 2489

The circumference of Baikal in km is the number b, which must be added to the empty space in the equation below so that its solution is x = 12,000.
(x / 30) + (x / 20) = x - …………
Thanks

Correct answer:

b =  11000 km

Step-by-step explanation:


x = 12000
(x/30) + (x/20) = x - b

x = 12000
60b-55x = 0

Pivot: Row 1 ↔ Row 2
60b-55x = 0
x = 12000


x = 12000/1 = 12000
b = 0+55x/60 = 0+55 · 12000/60 = 11000

b = 11000
x = 12000

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