What is the total number of laptops sold by store X?

Given:

Total laptops sold in three stores are 3000.

The number of HP laptops sold by store X is 40 more than the number of HP laptops sold by store Z.

The average number of HP laptops sold by store X and store Y is 350.

Store X alone sold 300 HP laptops.

Store Y sold a total of 575 laptops.

The ratio of the number of Dell laptops sold by store X and store Z is 2 : 3.

Calculation:

From the above-given data, we can say that HP laptops sold by store X and store Y = (2 × 350) = 700

Store X alone sold 300 HP laptops

So, the number of HP laptops sold by store Y = (700 - 300) = 400

So, the number of Dell laptops sold by store Y = (575 - 400) = 175

Now, according to the question, the number of HP laptops sold by store X is 40 more than the number of HP laptops sold by store Z

So, the number of HP laptops sold by store Z = (300 - 40) = 260

Now, total laptops that are sold = 3000

Remaining Dell laptops sold = {3000 - (300 + 400 + 260 + 175)}

⇒ 1865

According to the question, the ratio of the number of Dell laptops sold by store X and store Z is 2 : 3

So, the number of Dell laptops sold by store X = {1865 × (2/5)}

⇒ 746

Now, the number of Dell laptops sold by store Z = {1865 × (3/5)}

⇒ 1119

We can use a table and put these data.

So, the total number of laptops sold by store X = (746 + 300)

⇒ 1046

∴ The total number of laptops sold by store X is 1046.