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**Simple Algebra problem that is killing me!!**

## Homework Statement

From the set of equations below, involving the unknowns p, q, r, and t, find the values of t / r. (Use the correct number of significant figures.)

p = 7q

pr = qs

0.5pr^2 + 0.5qs^2 = 0.5qt^2

## Homework Equations

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## The Attempt at a Solution

I have been working on this problem for some time now. I have tried dividing all the terms by r^2 and seting (t/r)=x just to simplify the answer. I have come up with 7.5 and -7.5 but it says these answers are incorrect.