Showing posts with label Average. Show all posts
Showing posts with label Average. Show all posts

Thursday, February 09, 2012

TCS Aptitude Pattern 11 and 12

Pattern 11:

1. Simple question but big one on average age.sth like a, b, c weighted separately 1st a, b, c ,then a& b, then b & c ,then c & a at last abc, the last weight was 167,then what will be the average weight of the 7 reading?
 
a) 95 b) 95.428 c) 95.45 d) 94

Solution:
Last weight abc is 167i.e three persons weight is 167 .in first 6 combinations a,b,c,ab,bc,ac i.e a checked weight for 3 times totally like that band c also so total weight in all 7 combinations is (4*167)

Friday, December 23, 2011

Average related to Speed

If a person travels three equal distances at a speed of x km/hr, y km/hr and z km/hr.
Then average speed during the whole journey is given by

Average age related problems

Consider, average age of 10 boys is 15. When another boy is included the average age becomes 16. find the new boy's age.

Shortcut formula:

Candidate pass/fail problem

Suppose average marks obtained by 80 student is 40.
Average marks of passed candidates is 45 and that of failed candidates is 15.
Calculate no. of candidates who have passed or failed?

Shortcut Formula: