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Numerical Ability
Averages
.of a set of 30 numbers average of first 10 numbers =average of last 20 numbers then the sum of the last 20 numbers is? a)sum of first ten numbers b)2* sum of first ten numbers c)cannot be determined d)4* sum of last ten numbers
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- average of first ten number is same as average of last 20 numbers .
let the average be 100.
then summation of 10 numbers is 10 * 100 = 1000
hence summation of last 20 numbers is 20*100= 2000
therefore option b) 2*sum of first ten numbers - 8 years agoHelpfull: Yes(13) No(0)
- ans=b)2*sum of first ten numbers
- 8 years agoHelpfull: Yes(1) No(0)
- let x be the first 10 numbers sum
let y be the second 20 numbers sum
Given (x/10)=(y/20)
asked to find the sum of last 20 numbers i.e, y
y=(20*x)/10 - 4 years agoHelpfull: Yes(0) No(0)
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