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2013-01-28T18:43:56+01:00

soit x le stylo

 

6x + (4x +15) = 260

6x+4 x +60 = 260

10x = 260-60

10x  = 200

x = 20

 

prix du cahier = 20+15 = 35

 

6 stylos = 6*20 = 120

4 cahiers =( 20+15 )*4 = 35*4 = 140

 

140 +120 = 260