51 les bombetes de llum
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- 1. Les bombetes de llum
- 2.
- Bombetes 100W= x+4
- 3. Bombetes 60W= x
- 4.
- 60x+100(x+4)=2640
- 5. 60x+100x+400=2640
- 6. 60x+100x=2640-400
- 7. 160x=2240
- 8. X=2240/160=14
- 9.
- Bombetes 60W=14
- 10. Bombetes100W=18