Posted by Diana on .
There are a total of 700 blue, yellow, and red balls in a machine.
The ratio of blue balls to the total number of balls is 2:7.
The ratio of yellow balls to blue balls is 7:4.
The ratio of blue balls to red is 4:3.
With the given information calculate the number of blue balls, yellow balls and red balls.

Math  Ratio's 
PsyDAG,
Blue balls = 2:7 = 200/700 = 200
Blue to red = 4:3 = 200:x, red = 150
total  red  blue = yellow