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21-02-2022
Mathematics

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solve for x,y, and 15

solve for xy and 15 class=

Respuesta :

zsm2800 zsm2800

23-02-2022

Answer:

27

Step-by-step explanation:

x + y = 15 (gallons) (1)

0.25*x + 0.10 * y = 0.15 * 15 (2)

Multiply 100 on (2):

25x + 10y = 15

Divede by 5

5x + 2y = 3 (3)

From (1) y = 15 - x

so 5x + 10*(15 - x) = 15

5x + 150 - 10x = 15

-5x = 15 - 150 = -135

x = 135/5 = 27 (gallons)

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