Kathy spent
34 of her money on 14 pencils and 7 staplers. The cost of each stapler is 4 times the cost of each pencil. She bought some more pencils with
12 of her remaining money. How many pencils did Kathy buy altogether?
| 14 pencils + 7 staplers |
Remaining
amount |
Total
amount |
| 3 p = 42 u |
1 p = 14 u |
4 p |
14
pencils |
7
staplers |
More pencils |
Left |
|
| |
|
1 |
1 |
|
| 14 u |
28 u |
7 u |
|
|
Cost of 1 pencil = 1 u
Cost of 1 stapler = 4 u
Cost of 14 pencils = 14 x 1 u = 14 u
Cost of 7 staplers = 7 x 4 u = 28 u
Cost of 14 pencils + 7 staplers
= 14 u + 28 u
= 42 u
3 p = 42 u
1 p = 42 u ÷ 3 = 14 u
Amount of remaining money that Kathy spent on buying more pencils
=
12 x 14 u
= 7 u
Number of pencils that Kathy bought with
12 of her remaining money
= 7 u ÷ 1 u
= 7
Total number of pencils that Kathy bought
= 14 + 7
= 21
Answer(s): 21
