Sisters

Sisters Janka and Danka are saved together 220 CZK. On a trip to Janka wants to take a fifth of her savings and Danka's quarter. Then they will have 50 CZK on the trip. How much money saved Janka and Danka?

Correct answer:

J =  100
D =  120

Step-by-step explanation:


D+J = 220
J/5+D/4 = 50

D+J = 220
5D+4J = 1000

Pivot: Row 1 ↔ Row 2
5D+4J = 1000
D+J = 220

Row 2 - 1/5 · Row 1 → Row 2
5D+4J = 1000
0.2J = 20


J = 20/0.2 = 100
D = 1000-4J/5 = 1000-4 · 100/5 = 120

D = 120
J = 100

Our linear equations calculator calculates it.



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