When equal volumes of two metals are mixed together, the specific gravity of alloy is 4. When equal masses of the same two metals are mixed together, the specific gravity of the alloy is 3. Calculate the specific gravity of each metal.    


Correct option is

2 and 6


In case of two metals  


So, when equal volumes are mixed, V1 = V2 = V and  and 


and when equal masses are mixed, m1 = m2 = m and V1 = (m1) and V2 = (m2)  


Solving eq. (i) and (ii) for  we find that specific gravity of metals are 2 and 6. 



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