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**1. The problem statement, all variables and given/known data**

An object is in front of a convex mirror. We then obtain an erect image whose height is equal to 25% of the height of the object. What is the distance between the object and the mirror if we know that the focal distance is equal to 0.2m?

**2. Relevant equations**

M = Yi/Yo = q/p

1/p+1/q=1/f

Yi= height of the image

Yo = height of the object

q = distance of the image

p= distance of the object

M = magnification

f = focal distance

**3. The attempt at a solution**

M = Yi/Yo = 0.25 since the image is 25% the height of the object.

Then, since M=q/p, I know the distance from the object to the mirror is 4 times the distance of the image to the mirror.

This is where I'm stuck.