NandishSS wrote:HI Guru,
Can we take all the elements as 2 in these kinds of question?
What are easiest numbers to plug in?
I plugged in other numbers but struggled
Thanks
Nandish
The goal is to plug in easy numbers for L and K.
Let L = 2.
Sum of the original 19 numbers = (count)(average) = 19*2 = 38.
Let K = 50, implying that the average increases 50% from 2 to 3.
Since the average of the resulting set of 20 numbers = 3, the sum of the resulting set of twenty numbers = (count)(average) = 20*3 = 60.
Since the sum increases from 38 to 60, the added element = 60-38 = 22.
The question stem asks for the value of the added element: 22.
Now plug L=2 and K=50 into the answers to see which yields the target value of 22.
Only
A works:
L(1 + K/5) = 2(1 + 50/5) = 22.
The correct answer is
A.
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