Ivory spent
45 of her money on 12 pens and 8 staplers. The cost of each stapler is 2 times the cost of each pen. She bought some more pens with
67 of her remaining money. How many pens did Ivory buy altogether?
| 12 pens + 8 staplers |
Remaining
amount |
Total
amount |
| 4 p = 28 u |
1 p = 7 u |
5 p |
12
pens |
8
staplers |
More pens |
Left |
|
| |
|
6 |
1 |
|
| 12 u |
16 u |
6 u |
|
|
Cost of 1 pen = 1 u
Cost of 1 stapler = 2 u
Cost of 12 pens = 12 x 1 u = 12 u
Cost of 8 staplers = 8 x 2 u = 16 u
Cost of 12 pens + 8 staplers
= 12 u + 16 u
= 28 u
4 p = 28 u
1 p = 28 u ÷ 4 = 7 u
Amount of remaining money that Ivory spent on buying more pens
=
67 x 7 u
= 6 u
Number of pens that Ivory bought with
67 of her remaining money
= 6 u ÷ 1 u
= 6
Total number of pens that Ivory bought
= 12 + 6
= 18
Answer(s): 18
