Porcelain 18063

Four cups and one porcelain saucer cost € 140. Two cups and five saucers cost € 160. How much is a cup?

Correct answer:

s =  30 eur

Step-by-step explanation:


4s+t=140
2s+5t=160

4·s+t=140
2·s+5·t=160

4s+t = 140
2s+5t = 160

Row 2 - 2/4 · Row 1 → Row 2
4s+t = 140
4.5t = 90


t = 90/4.5 = 20
s = 140-t/4 = 140-20/4 = 30

s = 30
t = 20

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