100 bananas

Question: 

A man ate 100 bananas in 5 days, each day eating 6 more than the previous day. How many bananas did he eat on the first day?

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.

C

A

P

T

A

I

N

I

N

T

E

R

V

I

E

W

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Solution:

Let person ate x number of banana in first day =x
make equation
x.x+6, x+12, x+18, x+24 =100
x+x+x+x+x +6+12+18+24=100
5x+60 = 100
5x = 40
x = 8

Another approach is divide 100 by 5 =20 this is odd series so middle value and avg are same after that subtract 6 from every number 3rd number is 20, 2nd is 14 and 1st is 8
it will save your time 20s.

Another approach solves such question will option it will save your time 10s.

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