Yen spent
23 of her money on 12 pencils and 7 staplers. The cost of each stapler is 4 times the cost of each pencil. She bought some more pencils with
45 of her remaining money. How many pencils did Yen buy altogether?
| 12 pencils + 7 staplers |
Remaining
amount |
Total
amount |
| 2 p = 40 u |
1 p = 20 u |
3 p |
12
pencils |
7
staplers |
More pencils |
Left |
|
| |
|
4 |
1 |
|
| 12 u |
28 u |
16 u |
|
|
Cost of 1 pencil = 1 u
Cost of 1 stapler = 4 u
Cost of 12 pencils = 12 x 1 u = 12 u
Cost of 7 staplers = 7 x 4 u = 28 u
Cost of 12 pencils + 7 staplers
= 12 u + 28 u
= 40 u
2 p = 40 u
1 p = 40 u ÷ 2 = 20 u
Amount of remaining money that Yen spent on buying more pencils
=
45 x 20 u
= 16 u
Number of pencils that Yen bought with
45 of her remaining money
= 16 u ÷ 1 u
= 16
Total number of pencils that Yen bought
= 12 + 16
= 28
Answer(s): 28
