Children 8275

Forty children and adults attended the trip. Together they paid CZK 24,100. How many adults and children, if children paid CZK 400 and adults CZK 700?

Correct answer:

a =  13
b =  27

Step-by-step explanation:


a+b = 40
400a+700b = 24100

a+b = 40
400·a+700·b = 24100

a+b = 40
400a+700b = 24100

Pivot: Row 1 ↔ Row 2
400a+700b = 24100
a+b = 40

Row 2 - 1/400 · Row 1 → Row 2
400a+700b = 24100
-0.75b = -20.25


b = -20.25/-0.75 = 27
a = 24100-700b/400 = 24100-700 · 27/400 = 13

a = 13
b = 27

Our linear equations calculator calculates it.



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