Ivory spent
34 of her money on 10 staplers and 8 pens. The cost of each pen is 4 times the cost of each stapler. She bought some more staplers with
12 of her remaining money. How many staplers did Ivory buy altogether?
| 10 staplers + 8 pens |
Remaining
amount |
Total
amount |
| 3 p = 42 u |
1 p = 14 u |
4 p |
10
staplers |
8
pens |
More staplers |
Left |
|
| |
|
1 |
1 |
|
| 10 u |
32 u |
7 u |
|
|
Cost of 1 stapler = 1 u
Cost of 1 pen = 4 u
Cost of 10 staplers = 10 x 1 u = 10 u
Cost of 8 pens = 8 x 4 u = 32 u
Cost of 10 staplers + 8 pens
= 10 u + 32 u
= 42 u
3 p = 42 u
1 p = 42 u ÷ 3 = 14 u
Amount of remaining money that Ivory spent on buying more staplers
=
12 x 14 u
= 7 u
Number of staplers that Ivory bought with
12 of her remaining money
= 7 u ÷ 1 u
= 7
Total number of staplers that Ivory bought
= 10 + 7
= 17
Answer(s): 17
