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Dacă:

x=
[tex] \frac{x}{21} = \frac{10}{y} = \frac{5}{7} [/tex]
,atunci x+y =? ​


Răspuns :

7x=5*21
70=5y

x=15
y=14 deci x+y=29
7x = 105
x = 15
15/21 = 10/y
15y = 210
y = 14

x + y = 29