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Numerical Ability
Number System
If there are 30 numbers and the average of the first 10 numbers is equal to the average of last 20 number what is the sum of last 20 numbers
a) same as the sum of first 10 numbers
b) 2 times the sum of first 10 numbers
c) average of first 10 numbers
d) none of the above
Read Solution (Total 7)
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- avg of first 10 no.s= sum of 10 no./10
avg of last 20 no.s= sum of 20 no./20
as gven in question,
sum of first 10 no./10= sum of last 20 no./20
so asnwr comes b)
2 times sum of first 10 no.s - 10 years agoHelpfull: Yes(14) No(0)
- ans is (b)....2 times the sum of first 10 no.
- 10 years agoHelpfull: Yes(2) No(0)
- Ans is (b)
- 10 years agoHelpfull: Yes(1) No(1)
- 2*average of first ten numbers = sum of last ten number
- 10 years agoHelpfull: Yes(1) No(0)
- 2 times the sum of first 10 no.s(b)
- 10 years agoHelpfull: Yes(0) No(0)
- Ans : B
in firs condition we have only 10 numbers but where as second condition we have 20 numbers that means 2(10) so ANS : 2 times the sum of first 10 numbers. - 10 years agoHelpfull: Yes(0) No(0)
- two times the sum of first ten num
- 9 years agoHelpfull: Yes(0) No(0)
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