Răspuns:
Explicație pas cu pas:
Numerele a si b sunt proportionale cu 4 si 3 ⇒
a)
[tex]\frac{a}{b} =\frac{4}{3} \\\\b =\frac{a*3}{4} = a*\frac{3}{4}= a**\frac{75}{100}\\[/tex]
b repezinta 75% din a
b)
[tex]\frac{a + b}{2} = 14\\\\a + b = 2*14\\\\a + b = 28\\\\a + a*\frac{3}{4} = 28\\\\a*(1 + \frac{3}{4} ) = 28\\\\a*\frac{4+3}{4} = 28\\\\a*\frac{7}{4} = 28\\\\a*7 = 28*4\\\\a=\frac{28*4}{7 } \\\\a=4*4\\\\a=16\\\\b= a*\frac{3}{4} = 16*\frac{3}{4} = 4*3 = 12[/tex]
