Tammy spent
45 of her money on 12 pens and 5 markers. The cost of each marker is 4 times the cost of each pen. She bought some more pens with
12 of her remaining money. How many pens did Tammy buy altogether?
| 12 pens + 5 markers |
Remaining
amount |
Total
amount |
| 4 p = 32 u |
1 p = 8 u |
5 p |
12
pens |
5
markers |
More pens |
Left |
|
| |
|
1 |
1 |
|
| 12 u |
20 u |
4 u |
|
|
Cost of 1 pen = 1 u
Cost of 1 marker = 4 u
Cost of 12 pens = 12 x 1 u = 12 u
Cost of 5 markers = 5 x 4 u = 20 u
Cost of 12 pens + 5 markers
= 12 u + 20 u
= 32 u
4 p = 32 u
1 p = 32 u ÷ 4 = 8 u
Amount of remaining money that Tammy spent on buying more pens
=
12 x 8 u
= 4 u
Number of pens that Tammy bought with
12 of her remaining money
= 4 u ÷ 1 u
= 4
Total number of pens that Tammy bought
= 12 + 4
= 16
Answer(s): 16
