Professor, Section 5.2 Problem 5 page 165 Will ordered 2 times as many boxes of ballpoint pens as boxes of felt-tip pens. Ballpoints pens cost $3.50 per box, and felt-pens cost $4.50. If Will’s order of pens totaled $46, how many boxes of each type of pen did he buy? Cost of pens is $46. # of pens: 2 x as many ball point/felt-tips = 2 Cost of ballpoint pens = 3.5 Cost of ballpoint pens = 4.5 3.50 + 4.50 = 46 3.50 x 2 + 4.50 = 46 7.00 + 4.50 = 46 11.50 = 46 11.50 46
11.50 cancels itself out
11.50 11.50 =4 boxes 2 x 4 =8 Answer 4 boxes of Felt-tips pens
Check
8 boxes of ball point pens
3.50 x (8) + 4.50 (4) = 46 28 + 18 = 46 46 = 46