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

The average salary of all staff of a school is Rs.10,000. The average salary of 20 teaching staff is Rs.12,000 and that of non-teaching staff is Rs.5000, the number of non-teaching staff will be
1). 7
2). 8
3). 10
4). 12

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