A car collection has black cars, red cars and 7 white cars. Draw model of the car collection?
An automobile factory wants to produce a total of 210 cars during three shifts. If the first shift produces two-fifths of the cars and the second shift produce one-third of the cars, what fraction of the total cars does the third shift need to produce?
black cars, 
red cars and 7 white cars. Draw model of the car collection?
