A car company sold 150 cars in a special 6-day sale. Each day, the company sold 6 more than the previous day. How many cars were sold on the 6th day? (a) 35      (b) 40      (c) 50      (d) 60       (e) 70

A man ate 100 grapes in 5 days. Each day, he ate 6 more grapes than those he ate on the earlier day. How many grapes did he eat on the first day?

If the number of cars sold of model D is 40500, then how many more cars of model E are sold than that of A?

A can finish a work in 14 days at 6 hrs a day. B can finish it in 8 days at 2 hrs a day. Find in how many days they can finish it working together 4 hrs a day.

The following bar graph shows infomiation on the sales of the personal computers by the company "XYZ" for the last 10 year? How many units of personal computers were sold by the company XYZ in 2011? (a)60 (b)50 (c)80 (d)70