Sun	Mon	Tue	Wed	Thu	Fri	Sat
30	31	1	2	3	4	5
6	7	8	9	10	11	12
13	14	15	16	17	18	19
20	21	22	23	24	25	26
27	28	29	30	1	2	3
4	5	6	7	8	9	10

Back to Main Page

Multiple Choice Questions

The average age of group of persons going for picnic is 16 years Twenty new persons with an average ...........

Numerical Ability Average

The average age of group of persons going for picnic is 16 years. Twenty new persons with an average age of 15 years join the group on the spot due to which their average becomes 15.5 years. Find the number of persons initially going for picnic.

छोटे Courses बड़े Results

Master Average

Prepare through Micro-courses

Try Now

Explanation:

Average age of 'n' number of persons = 16
Total age of 16 persons = 16n
Number of men after increase = (n + 20)
Average age of (n + 20) men = 15.5
Total age of (n + 20) men = (n + 20) x 15.5
Average age of 20 men = 15
Total age of 20 men = 20 x 15 = 300
⇒ (n + 20) x 15.5 = 16n + 300
⇒ 15.5 n + 310 = 16n + 300
⇒ 10 = 0.5 n
⇒ n = 20

Hence, option 2 is the correct answer.

Report error

Submit Error