Directions (61-65):The line graph given below shows the number of laptops (HP and Dell) sold by Hemant in five days. Read the Line graph given below carefully and answer the following questions.

From Monday to Friday, 20% of total Dell laptops found defective while 60% of remaining remains unsold. Find the total no. of Dell laptops.

The correct answer is 1250.

From the provided line graph, we can observe the number of Dell laptops (represented by the orange line with square data points) sold across the five days:

- Dell laptops sold on Monday = 70
- Dell laptops sold on Tuesday = 140
- Dell laptops sold on Wednesday = 30
- Dell laptops sold on Thursday = 70
- Dell laptops sold on Friday = 90

First, calculate the total number of Dell laptops sold from Monday to Friday:

$\text{Total Dell laptops sold}=70+140+30+70+90=400$

Let the total number of Dell laptops be $N$.

According to the problem statement, 20% of total Dell laptops were found defective. Therefore, the percentage of non-defective Dell laptops is:

$\text{Non-defective Dell laptops}=100\%-20\%=80\%\text{of}N=0.80N$

Out of the non-defective Dell laptops, 60% remain unsold, which means that the remaining 40% of non-defective laptops were sold:

$\text{Sold Dell laptops}=40\%\text{of}0.80N$

$\text{Sold Dell laptops}=0.40\times 0.80N=0.32N$

Equating the expression for sold laptops to the total number of sold laptops found from the line graph:

$0.32N=400$

$N=\frac{400}{0.32}$

$N=\frac{400\times 100}{32}=1250$

Thus, the total number of Dell laptops is 1250.