Kumar has three boxes of counters A, B and C. There are x counters in box A.
There are (2x + 7) counters in box B.
There are (3x – 4) counters in box C.
There is a total of 75 counters in the three boxes.
Work out the number of counters in box B.

Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.