Aptitude Day 182

 Answers of Day 181: 

1.       8 years.

2.       38 years.

Problems on Average:

1. The average salary of all the workers in a workshop is 6000. The average salary of 8 technicians is 10000 and the average salary of the rest is 2000. The total number of workers in the workshop is:

Solution:

                 Let the total number of workers be x.

                 6000x = 10000*8 + 2000*(x-8)

                 [Note: Remaining workers = x-8]

                  6000x = 80000 + 2000x – 16000

                  4000x = 64000

                  x = 16.  

2. In an examination, a pupil’s average marks were 70 per paper. If he had obtained 30 more marks for his Science paper and 5 more marks for his Maths paper, his average per paper would have been 75. How many papers were there in the examination?

Solution:

                 Let the number of papers be x.

                 

                 70x+ 30+ 5 = 75x

                 35 = 5x

                 x =7.