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What's the answer to this world problem please:

Mr. See got $1675 from selling 50 thumb drives and computer keyboards. Each thumb drives cost $24 and each computer keyboard cost $49. How many computer keyboards did he sell?

Respuesta :

Answer:

19 keyboards

Step-by-step explanation:

Let d = thumb drives; and k = computer keyboards

Total number of sales of thumb drives and keyboards is 50

50 = d + k

Rearranged:

d = 50 - k

Total revenue from the sale of $24 thumb drives and $49 keyboards is $1675

1675 = 24d + 49k

Sub in d = 50 - k

1675 = 24(50 - k) + 49k

1675 = 1200 - 24k + 49k

475 = 25k

k = 475/25

k = 19

(To check, d = 50 - 19 = 31)
The answer to this question is 10

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