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Mathematics, 04.09.2021 20:20 anahitrejo1

In a car park the ratio of white cars to black cars is 2:7. The ratio of white cars to red cars is 3:11. Altogether there are 343 white, black and red cars. How many black cars are in the car park? Could anyone please teach me the method?​

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In a car park the ratio of white cars to black cars is 2:7. The ratio of white cars to red cars is 3...
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