a)
[tex] \frac{13}{8} [/tex]
b)
[tex] \frac{12}{11} [/tex]
c)
[tex] \frac{31}{15} [/tex]
d)
[tex] \frac{56}{8} [/tex]
e)
[tex] \frac{72}{12} [/tex]
f)
[tex] \frac{12}{18} [/tex]
7.a)
[tex] \frac{4}{12} = \frac{1}{3} [/tex]
b)
[tex] \frac{3}{9} = \frac{1}{3} [/tex]
c)
[tex] \frac{18}{76} = \frac{9}{38} [/tex]
d)
[tex] \frac{3}{9} = \frac{1}{3} [/tex]
e)
[tex] \frac{2}{2} = \frac{1}{1} [/tex]
f)
[tex] \frac{31}{3} [/tex]
g)
[tex] \frac{21}{7} = \frac{3}{1} [/tex]
h)
[tex] \frac{32}{20} = \frac{16}{10} = \frac{8}{5} [/tex]
9. 45%+25%=70%
100%-70%=30%