The average marks of six students is ‘x’ and the average marks of three of these students is ‘y’. If the average marks of the remaining three students is ‘z’, then the relationship of x,y and z can be expressed as

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The average marks of six students is ‘x’ and the average marks of three of these students is ‘y’. If the average marks of the remaining three students is ‘z’, then the relationship of x,y and z can be expressed as