Together 7606

Jana and Dana have saved 220 crowns together. Jana spent a fifth of her savings, Dana a quarter. Then they had a total of CZK 150 left. How much have they saved?

Correct answer:

d =  520
j =  -300

Step-by-step explanation:


220 = j+d
220 - (j/5 + d/4) = 150

d+j = 220
5d+4j = 1400

Pivot: Row 1 ↔ Row 2
5d+4j = 1400
d+j = 220

Row 2 - 1/5 · Row 1 → Row 2
5d+4j = 1400
0.2j = -60


j = -60/0.2 = -300
d = 1400-4j/5 = 1400-4 · (-300)/5 = 520

d = 520
j = -300

Our linear equations calculator calculates it.



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