Children study cost

The parents have their 3 children at studies. They cost CZK 3,650 per month. Parents pay 350 CZK less per month for Lee than for Dennis and 400 CZK more for Eve than for Dennis. How many CZK per month will he pay for each of them?

Final Answer:

L =  850
Z =  1200
e =  1600

Step-by-step explanation:


L+Z+E=3650
L = Z-350
E = 400 + Z

L+Z+e=3650
L = Z-350
e = 400 + Z

L+Z+e = 3650
L-Z = -350
Z-e = -400

Row 2 - Row 1 → Row 2
L+Z+e = 3650
-2Z-e = -4000
Z-e = -400

Row 3 - 1/-2 · Row 2 → Row 3
L+Z+e = 3650
-2Z-e = -4000
-1.5e = -2400


e = -2400/-1.5 = 1600
Z = -4000+e/-2 = -4000+1600/-2 = 1200
L = 3650-Z-e = 3650-1200-1600 = 850

L = 850
Z = 1200
e = 1600

Our linear equations calculator calculates it.



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