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**Proportions help needed!!**

Three water masses (I, II, III) are mixed together to form a resultant water mass (R).

I: T=5 deg C, S=35.50 ppt

II: T=2 deg C, S=34.50 ppt

III: T= 1 deg C, S=35.25 ppt

R: T= 3 deg C, S=35.00 ppt

What were the relative proportions of I, II, and III that were mixed together to form R?

Someone please help, I don't even know where to start...