Math questions

3.5 kg of Grade A coffee powder is mixed with 5.25 kg of Grade B coffee powder. The mixture is then packed into packets of 30g each. (a)how many 30-g packets are there? (b)how many grams of mixture are left over?

$A=3.5\ kg \qquad B=5.25\ kg\\ A+B= 3.5\ kg + 5.25\ kg \\ A+B = 8.75\ kg$

(a) $\frac{8.75\ kg}{0.030\ kg} \qquad |\qquad 30\ g = 0.030\ kg\\ = 291.6\overline{6}~ \text{ packets}$

There are 291 30-g packets

(b)  $0.6\overline{6}*0.030\ kg = 0.02\ kg = 20\ g$

20 g of mixture are left over.