MBA Exam Logical Reasoning Coding Decoding

The average age of a couple is 25 years .The average age of the family just after the birth of the first child was 18 years.The average age of the family just after the second child was born was 15 years.The average age of the family after the third and the fourth children were born was 12 years .If the present age of the family of six persons is 16 years,how old is the eldest child?

1) 7
2) 8
3) 9
4) 11

Read Solution (Total 1)

h=husband, w=wife, fc=1st child, sc=2nd child, 2tc=twins(3rd & 4th)
h+w=25*2=50
h+w+fc=18*3=54
h+w+fc+sc=15*4=60 so difference=60-54=6 => fc=6/3=2
h+w+fc+sc+2tc=12*6=72 so difference=72-60=12 => fc=2+12/4=5
h+w+fc+sc+2tc=16*6=96 so difference=96-72=24 => fc=5+24/6=9
therefore, answer is 9 i.e., option 3
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MBA Other Question

Easy oneOne man can do as much work in one day as a woman can do in 2 days. A child does one third the work in a day as a woman. If an estate-owner hires 39 pairs of hands, men, women and children in the ratio 6 : 5 : 2 and pays them in all Rs. 1113 at the end of the days work. What must the daily wages of a child be, if the wages are proportional to the amount ofwork done?(a) Rs.14(b) Rs.5(c) Rs.20(d) Rs.7

1) 1
2) 2
3) 3
4) 4
Given (211214311)5 + (828761206)9 What is the remainder when the above number is divided by 4?

1) 0
2) 1
3) 2
4) 3