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## Homework Statement

A block of copper at 100.0° C comes into contact with a block of aluminum at 20.0°C. The final temperature of the blocks is 60.0°C. What are the relative masses of the blocks?

## Homework Equations

mcΔT

copper specific heat = .386 J/g°C

aluminum specific heat = .900 J/g°C

## The Attempt at a Solution

(x)(.386 J/g°C)(40°C) = (x)(.900 J/g°C)(-40°C)

what I use to try to find the mass, assuming that the energy lost in one part of the system is gained by the other.... Also, what is meant by "relative" mass in this question?

Until I realize this equation cannot be solved...

Any help is appreciated not really sure how to go about doing this problem, I feel like Im missing something because this should be very easy.