The chocolate

The entire chocolate has 8 by 4 pieces and weighs 160g.
Express with a fraction how much of the chocolate we ate (according to the picture, we ate 9 squares of chocolate).
How many grams of chocolate did we eat?

Correct answer:

a =  9/32
b =  45 g

Step-by-step explanation:

$$\begin{gathered} n=8\cdot 4=32 \\ m=160\text{g} \\ a=\frac{9}{n}=\frac{9}{32}=0.2813 \end{gathered}$$

$b=m\cdot \frac{9}{n}=160\cdot \frac{9}{32}=\frac{160\cdot 9}{32}=\frac{1440}{32}=45\text{g}$

Try another example