Pohádkov 3118

The brothers live in a small house with a garden in Pohádkov. The house has four times more windows than doors. There are a total of 20 windows and doors in the house. How many windows and how many doors?

Correct answer:

d =  4
o =  16

Step-by-step explanation:


20=o+d
o=4d

20=o+d
o=4·d

d+o = 20
4d-o = 0

Pivot: Row 1 ↔ Row 2
4d-o = 0
d+o = 20

Row 2 - 1/4 · Row 1 → Row 2
4d-o = 0
1.25o = 20


o = 20/1.25 = 16
d = 0+o/4 = 0+16/4 = 4

d = 4
o = 16

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