Question

Sadie finished her math test in sixteen minutes less than three times the amount of time it took her friend Laura to finish. If their combined time was 1 hour and 8 minutes (68 minutes), how long did Sadie take?

Answer 1

47 minutes

Explanation:

Let k be the amount of time Laura took.

Then Sadie would be 3k-16. So

k+3k-16=68

4k=84

k=21 minutes for Laura

Sadie=3(21)-16=47 minutes ......