Question

a boy and his sister ran some laps the boy ran 2.5 times as many left as his sister together they run seven laps how many laps did each one

Answer 1

Let the laps run by the sister be x

The laps run by the boy is 2.5 times the laps by the sister. Thus the laps run by the boy is

`2.5x`

The total laps by the boy and the girl is 7. Therefore,

`\begin{gathered} x+2.5x=7 \\ 3.5x=7 \\ x=(7)/(3.5)=2 \\ \text{The laps by sister is 2.} \\ 2.5x=2.5\ast2=5 \\ \text{Thus, the laps by boy is 5} \end{gathered}`