Question

The table shows the distance the students a group of students walked during after-school practice. What was the total distance, in miles, the students walked during after-school practice?

Answer 1

First let's convert the decimal numbers to mixed numbers:

`\begin{gathered} 3.4=3+0.4=3+(4)/(10)=3+(2)/(5)=3(2)/(5) \\ 1.75=1+0.75=1+(75)/(100)=1+(3)/(4)=1(3)/(4) \\ 2.25=2+0.25=2+(25)/(100)=2+(1)/(4)=2(1)/(4) \end{gathered}`

Now, adding all the numbers, we have:

`\begin{gathered} (3+(2)/(5))+(3+(1)/(5))+(1+(3)/(4))+(2+(1)/(4))+(1+(7)/(10)) \\ =(3+3+1+2+1)+((2)/(5)+(1)/(5)+(3)/(4)+(1)/(4)+(7)/(10)) \\ =10+((3)/(5)+1+(7)/(10)) \\ =11+((6)/(10)+(7)/(10)) \\ =11+(13)/(10) \\ =12+(3)/(10)=12(3)/(10) \end{gathered}`

So the correct option is B.