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The average of five consecutive multiple...

The average of five consecutive multiples of 3 is 90 . What is the middle numbers? What are the other numbers?

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Middle term of five consecutive multiples of `3=(90)/(5)=18`
Middle term `=18=6 xx 3 .`
So the terms just before it are `5 xx 3,4 xx 3`. Like this, just after terms of `6 xx 3` are `7 xx 3,8 xx 3`.
Terms are. `12,15,18,21_(i) 24`
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