14 per 20 + 12 per 10

38/20=19/10
=1 9/10
maaf kalau salah

[tex] = \frac{14}{20} + \frac{12}{10} \\ = \frac{14}{20} + ( \frac{12 \times 2}{10 \times 2} ) \\ = \frac{14}{20} + \frac{24}{20} \\ = \frac{38}{20} \ \: disederhanakan \: menjadi \\ = \frac{19}{10} \\ = 1 \frac{9}{10} [/tex]