Bantu jawab dong yg no 4 itu

4a)
[tex] \frac{6}{6+4}= \frac{8}{8+a}\\ \frac{6}{10}= \frac{8}{8+a}\\ \frac{3}{5}= \frac{8}{8+a}\\ 3 \times(8+a) = 5 \times 8\\ 24 + 3a = 40\\ 3a = 40 - 24\\ 3a = 16\\ a = 16 \div 3\\ \bold{a = 5,33}[/tex]

4b)
[tex] \frac{2}{2+3} = \frac{b}{b+5}\\ \frac{2}{5} = \frac{b}{b+5}\\ 5\times b = 2\times(b+5)\\ 5b = 2b+10\\ 5b - 2b = 10\\ 3b = 10\\ b = 10 \div 3\\ \bold{b = 3,33}[/tex]

4c)
[tex] \frac{c}{c+4}= \frac{5}{5+3}\\ \frac{c}{c+4}= \frac{5}{8}\\ 8 \times c = (c + 4) \times 5\\ 8c = 5c + 20\\ 8c - 5c = 20\\ 3c = 20\\ c = 20 \div 3\\ \bold{c = 6,67}[/tex]

4d)
[tex] \frac{d}{d+6}= \frac{4}{4+8}\\ \frac{d}{d+6}= \frac{4}{12}\\ \frac{d}{d+6}= \frac{1}{3}\\ 3 \times d = 1 \times(d+6)\\ 3d = d + 6\\ 3d - d = 6\\ 2d = 6\\ d = 6 \div 2\\ \bold{d = 3}[/tex]