Answer:
a. [tex]5 \frac{21}{40} [/tex]
b. [tex] \frac{1}{42} [/tex]
Step-by-step explanation:
[tex]a. \: 12 \frac{2}{5} - 6 \frac{7}{8} [/tex]
[tex] \frac{62}{5} - \frac{55}{8} [/tex]
[tex] \frac{62}{8} \times \frac{8}{8} - \frac{55}{8} \times \frac{5}{5} [/tex]
[tex] \frac{62 \times 8 - 55 \times 5}{40} [/tex]
[tex] \frac{221}{40} [/tex]
[tex]5 \frac{21}{40} [/tex]
[tex]b. \: \frac{3}{14} - \frac{4}{21} [/tex]
[tex] \frac{3}{14} \times \frac{3}{3} - \frac{4}{21} \times \frac{2}{2} [/tex]
[tex] \frac{3 \times 3}{42} - \frac{4 \times 2}{42} [/tex]
[tex] \frac{1}{42} [/tex]
Hope it is helpful....
