The average of 10 consecutive odd numbers is 120. What is the average of the 5 largest numbers

Answers (1)
S safeer

The total sum of the numbers=120 x 10=1200 tht is 

1200=10 x smallest number + (2+4+...+18)

1200-(2+4+...18)=10 x smallest number

1200-4.5 x 20= 10 x smallest number

smallest number= 111

The largest five numbers are 121,123,125,127,129

The average = (5x120+1+3+5+7+9)/5=625/5=125

 

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