Subject
Quantitative Aptitude
Topic
Average
The average age of a 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 age becomes 15.5 years. The number of persons initially going for picnic is :
The average age of a 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 age becomes 15.5 years. The number of persons initially going for picnic is :
ক)
15খ)
20গ)
30ঘ)
45Explanation
Let the initial number of persons be x. Then, 16x + 20 * 15 = 15.5 (x + 20) <=> 0.5x = 10 <=> x = 20.Related questions
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