Tiffany spent
58 of her money on 6 foolscaps and 7 pens. The cost of one pen was twice the cost of one foolscap. She bought some more pens with
16 of her remaining money. How many pens did Tiffany buy altogether?
6 foolscaps and
7 pens |
Remaining amount |
| 5x2 |
3x2 |
| |
More pens |
Left |
| |
1x1 |
5x1 |
| 10 p |
1 p |
5 p |
Cost of 1 foolscap = 1 u
Cost of 1 pen = 2 u
Cost of 6 foolscaps = 6 x 1 u = 6 u
Cost of 7 pens = 7 x 2 u = 14 u
Total cost of 6 foolscaps and 7 pens
= 6 u + 14 u
= 20 u
10 p = 20 u
1 p = 20 ÷ 10 = 2 u
Amount that Tiffany used to buy more pens
= 1 p
= 1 x 2 u
= 2 u
Number of more pens that Tiffany bought
= 2 u ÷ 2 u
= 1
Total number of pens that Tiffany bought
= 7 + 1
= 8
Answer(s): 8
