Tiga buah lantong plastik masing - masing berisi gula, beratnya 2 1/4 kg, 1 1/2 kg , dan 3 3/10 kg. Berat ketiga kantong itu =....kg

[tex]2 \frac{1}{4} + 1 \frac{1}{2} + 3 \frac{3}{10} \\ = \frac{9}{4} + \frac{3}{2} + \frac{33}{10} \\ = \frac{45}{20} + \frac{30}{20} + \frac{66}{20} \\ = \frac{141}{20} kg \\ = 7 \frac{1}{20} kg[/tex]