Question

If a shopkeeper sold 50 air conditioners in a week, how much air conditioner he needs to sell each day for the remaining days such that the average air conditioner sold for 15 days is 6?
1. 7
2. 5
3. 3
4. 10
5. 12

Answer 1

Correct Answer - Option 2 : 5

Given:

Average number of air conditioners sold in 15 days = 6

In 1 week or 7 days 50 air conditioners are sold

Formula used: 

Average = (Sum of value of all the numbers)/(Total numbers)

Solution:

Average number of air conditioners sold in 15 days = 6

⇒ Total air conditioners sold in 15 days = 15 × 6 = 90

50 air conditioners are sold in 7 days 

∴ Remaining days = 15 – 7 = 8

Remaining air conditioners sold in 8 days = 90 – 50 = 40

∴ Air conditioners sold each day = 40/8 = 5