Tina spent
23 of her money on 10 markers and 9 files. The cost of each file is 2 times the cost of each marker. She bought some more markers with
67 of her remaining money. How many markers did Tina buy altogether?
| 10 markers + 9 files |
Remaining
amount |
Total
amount |
| 2 p = 28 u |
1 p = 14 u |
3 p |
10
markers |
9
files |
More markers |
Left |
|
| |
|
6 |
1 |
|
| 10 u |
18 u |
12 u |
|
|
Cost of 1 marker = 1 u
Cost of 1 file = 2 u
Cost of 10 markers = 10 x 1 u = 10 u
Cost of 9 files = 9 x 2 u = 18 u
Cost of 10 markers + 9 files
= 10 u + 18 u
= 28 u
2 p = 28 u
1 p = 28 u ÷ 2 = 14 u
Amount of remaining money that Tina spent on buying more markers
=
67 x 14 u
= 12 u
Number of markers that Tina bought with
67 of her remaining money
= 12 u ÷ 1 u
= 12
Total number of markers that Tina bought
= 10 + 12
= 22
Answer(s): 22
