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?​

Which of the following properties can be used to show

The classrooms are trying to raise $1,200.00 for charity. mrs. leblanc's class has raised 50%. mr. patel's class has raised $235.14 ms. warner's class has raised 1/3 as much as mrs. leblanc's class. how much more money is needed to reach the goal of $1,200.00?

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.