Kilograms 5994

The courier brought four packages to the company that weighed 3.5 kg, 2 1/5 kg, 3/4 kg, and 250 g. How much did all the packages weigh together? Give the result in kilograms and write it as a decimal number.

Correct answer:

m =  6 ⁷⁄₁₀ = 67/10 kg

Step-by-step explanation:

$$\begin{gathered} a=3.5\text{kg} \\ b=2\frac{1}{5}=2+\frac{1}{5}=\frac{2\cdot 5+1}{5}=\frac{10+1}{5}=\frac{11}{5}=2.2 \\ c=3/4=\frac{3}{4}=0.75\text{kg} \\ d=250\text{g}\to \text{kg}=250:1000\text{kg}=0.25\text{kg} \\ m=a+b+c+d=3.5+2.2+0.75+0.25=\frac{67}{10}\text{kg}=6\frac{7}{10}\text{kg}=6.7\text{kg} \end{gathered}$$

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