Olivia spent
23 of her money on 14 pens and 7 markers. The cost of each marker is 4 times the cost of each pen. She bought some more pens with
23 of her remaining money. How many pens did Olivia buy altogether?
| 14 pens + 7 markers |
Remaining
amount |
Total
amount |
| 2 p = 42 u |
1 p = 21 u |
3 p |
14
pens |
7
markers |
More pens |
Left |
|
| |
|
2 |
1 |
|
| 14 u |
28 u |
14 u |
|
|
Cost of 1 pen = 1 u
Cost of 1 marker = 4 u
Cost of 14 pens = 14 x 1 u = 14 u
Cost of 7 markers = 7 x 4 u = 28 u
Cost of 14 pens + 7 markers
= 14 u + 28 u
= 42 u
2 p = 42 u
1 p = 42 u ÷ 2 = 21 u
Amount of remaining money that Olivia spent on buying more pens
=
23 x 21 u
= 14 u
Number of pens that Olivia bought with
23 of her remaining money
= 14 u ÷ 1 u
= 14
Total number of pens that Olivia bought
= 14 + 14
= 28
Answer(s): 28
