Mr. Fish

Mr. Fish paid 1,080 CZK for the purchase of three Christmas carpets.
The difference in weights (in this order) between the first and second carp and between the second and third carp was exactly 80 dag. The price of 1 kg of live carp was 120 CZK.
a) Calculate in kilograms the weight of each of the carp.
b) Calculate in kilograms the weight of all three carp together.

Final Answer:

m =  9 kg
a =  2.2 kg
b =  3 kg
c =  3.8 kg

Step-by-step explanation:

$$\begin{gathered} 1080=m\cdot 120 \\ 120m=1080 \\ m=\frac{1080}{120}=9 \\ m=9=9\text{kg} \end{gathered}$$

$$\begin{gathered} b=m/3=9/3=3 \\ a=b-0.8=3-0.8=2.2\text{kg} \end{gathered}$$

$c=b+0.8=3+0.8=3.8\text{kg}$

Try another example