If the ratio of students packing a lunch to those buying lunch is 2: 9, then the number of students buying lunch is times the number of students packing a lunch.

4.5 times

Step-by-step explanation:

Given : The ratio of students packing a lunch to those buying lunch is 2:9

To  Find :  The number of students buying lunch is ______ times the number of students packing a lunch.

Solution :

let x denotes the no. of students packing a lunch

let y denotes the no. of students buying a lunch

Since the ratio is 2:9

⇒

⇒

⇒

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Since y denotes the no. of students buying a lunch and x denotes the no. of students packing a lunch

Thus , The number of students buying lunch is 4.5 times the number of students packing a lunch.

the answer is 31.27mph