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Out of the five numbers average of first four numbers us 15 and the average of last 4 numbers is 12 .also last number is 18 .what is the first number |
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Answer» LET the NUMBERS be a,B,C,d and e=18 {GIVEN} (a+b+c+d)/4=15 a+b+c+d=60 ∴a=60-(b+c+d) (b+c+d+e)/4=12 b+c+d+e=48 b+c+d+18=48 ∴b+c+d=48-18=30 a=60-(b+c+d) a=60-30 ∴a=30 |
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