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A ratio of white to black cars is 2:7 A ratio of white to red cars is 3:11. There is a total of 343 white red and black cars. How many black cars are there?

 Mar 27, 2023
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B==Black,  W==White,  R==Red

 

W / B ==2 / 7..........................................(1)

W / R ==3 / 11........................................(2)

B + W + R ==343....................................(3), solve for B, W, R

 

Use substitution to get:

 

B ==147 - Number of black cars

W==42 - Number of white cars

R ==154 - Number of red cars

 Mar 27, 2023

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