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Daca p % din 120 = 36 , aflati p


inca una


x,y direct proportionale cu 3 si 4 , ..... 3x+4y=75 x,y = ?


Răspuns :

p/100*120=36
120p/100=36
120p=3600
p=3600/120
p=30

===================================
x=3k
b=4k

3*3k+4*4k=75
9k+16k=75
25k=75
k=3

x=3*3=9
y=4*3=12