Each day, a computer company produces 20 more laptops computers than desktop computers. On a certain day, 5% of the laptop computers and 7% of the desktop computers were found to be defective. If the total number of desktop and laptop computers that were found to be defective that day was 16, how many laptop computers did the computer company make that day?

Question

Mathematics

Kirsten House

17 December, 08:14

Each day, a computer company produces 20 more laptops computers than desktop computers. On a certain day, 5% of the laptop computers and 7% of the desktop computers were found to be defective. If the total number of desktop and laptop computers that were found to be defective that day was 16, how many laptop computers did the computer company make that day?

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Answers (2)

Know the Answer?

Agustin Boyd · Answer 1

l: laptop, d: desktop

d = l-20

(5l + 7d) / 100 = 16

5l + 7l - 140 = 1600

12l = 1740

l = 145

Solomon Weeks · Answer 2

Let x be the no. of laptop computers make that day

20 more laptops computers than desktop computers

so no. of desktop computers = x-20

5% of the laptop computers and 7% of the desktop computers

= 0.05x + 0.07 (x-20)

= 0.05x + 0.07x - 1.4

= 0.12x - 1.4

which equal to 16

so 0.12x-1.4 = 16

0.12x = 17.4

x=145

so the company builds 145 laptop computers that day