Erika spent
45 of her money on 12 staplers and 6 pencils. The cost of each pencil is 2 times the cost of each stapler. She bought some more staplers with
56 of her remaining money. How many staplers did Erika buy altogether?
| 12 staplers + 6 pencils |
Remaining
amount |
Total
amount |
| 4 p = 24 u |
1 p = 6 u |
5 p |
12
staplers |
6
pencils |
More staplers |
Left |
|
| |
|
5 |
1 |
|
| 12 u |
12 u |
5 u |
|
|
Cost of 1 stapler = 1 u
Cost of 1 pencil = 2 u
Cost of 12 staplers = 12 x 1 u = 12 u
Cost of 6 pencils = 6 x 2 u = 12 u
Cost of 12 staplers + 6 pencils
= 12 u + 12 u
= 24 u
4 p = 24 u
1 p = 24 u ÷ 4 = 6 u
Amount of remaining money that Erika spent on buying more staplers
=
56 x 6 u
= 5 u
Number of staplers that Erika bought with
56 of her remaining money
= 5 u ÷ 1 u
= 5
Total number of staplers that Erika bought
= 12 + 5
= 17
Answer(s): 17
