The average of a, b and c is 20 and that of b, c and d is 25. If d = 30, then the value of a is :

The average of a, b and c is 20 and that of b, c and d is 25. If d = 3

1.	The average of a, b and c is 20 and that of b, c and d is 25. If d = 30, then the value of a is :
A.	25
B.	45
C.	30
D.	15
Answer» E.

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The average of a, b and c is 20 and that of b, c and d is 25. If d = 30, then the value of a is :

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