Bonjour
Soit x ce nombre
3/4x + 2/5x = 69
15/20x + 8/20 x = 69
23/20x = 69
X = 69 * 20/23
X = 23*3 * 20/23
X = 3*20
X = 60
bonjour
soit x le nombre cherché
3 x /4 + 2 x /5 = 69
15 x /20 + 8 x /20 = 1 380/20
15 x + 8 x = 1 380
23 x = 1 380
x = 60
60 x 3/4 + 60 x 2/5 = 45 + 24 = 69
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Bonjour
Soit x ce nombre
3/4x + 2/5x = 69
15/20x + 8/20 x = 69
23/20x = 69
X = 69 * 20/23
X = 23*3 * 20/23
X = 3*20
X = 60
bonjour
soit x le nombre cherché
3 x /4 + 2 x /5 = 69
15 x /20 + 8 x /20 = 1 380/20
15 x + 8 x = 1 380
23 x = 1 380
x = 60
60 x 3/4 + 60 x 2/5 = 45 + 24 = 69