Together 8293

Shrek and Fiona together weigh 201 kg. And Shrek is two times heavier than Fiona. How much does Shrek weigh?

Correct answer:

S =  134 kg

Step-by-step explanation:


S+F = 201
S = 2·F

F+S = 201
2F-S = 0

Pivot: Row 1 ↔ Row 2
2F-S = 0
F+S = 201

Row 2 - 1/2 · Row 1 → Row 2
2F-S = 0
1.5S = 201


S = 201/1.5 = 134
F = 0+S/2 = 0+134/2 = 67

F = 67
S = 134

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