[tex]\displaystyle\bf\\f=numarul~de~fete\\b=numarul~de~baieti\\\\f=25\%~din~numarul~de~baieti\\\implies~f=un~sfert~din~numarul~de~baieti.\\\\f=\frac{b}{4}\\\\b+\frac{b}{4}=35~~\Big|~\times4\\\\4b+b=35\times4\\\\5b=140\\\\b=\frac{140}{5}\\\\\boxed{\bf b=28~de~baieti~sunt~in~grup}~~~(punctul~c))\\\\f=\frac{28}{4}\\\\\boxed{\bf f=7~fete~sunt~in~grup} \\\\b)\\f=7 \\procent~fete~din~grup=\frac{7}{35}=\frac{1}{5}=\boxed{\bf20\%~fete~sunt~in~grup}[/tex]
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[tex]\displaystyle\bf\\a)\\\\b=28\\f=7\\Procentul~de~baieti~din~numarul~fetelor = \\\\=\frac{b}{f}=\frac{28}{7}=\frac{28}{7}=\frac{4}{1}=\boxed{\bf400\%~baieti~din~numarul~fetelor}\\\\Asta~inseamna~ca~sunt~de~4~ori~mai~multi~baieti~decat~fete.[/tex]
