The average salary of all staff of a school is 10,000. The average salary of 20 teaching staff is 12,000 and that of non-teaching staff is 5000, the number of non-teaching staff will be

The average salary of all staff of a school is 10,000. The average sa

1.	The average salary of all staff of a school is 10,000. The average salary of 20 teaching staff is 12,000 and that of non-teaching staff is 5000, the number of non-teaching staff will be
A.	7
B.	8
C.	10
D.	12
Answer» C. 10

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The average salary of all staff of a school is 10,000. The average salary of 20 teaching staff is 12,000 and that of non-teaching staff is 5000, the number of non-teaching staff will be

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