Gillian spent
34 of her money on 12 pens and 9 pencils. The cost of each pencil is 4 times the cost of each pen. She bought some more pens with
78 of her remaining money. How many pens did Gillian buy altogether?
| 12 pens + 9 pencils |
Remaining
amount |
Total
amount |
| 3 p = 48 u |
1 p = 16 u |
4 p |
12
pens |
9
pencils |
More pens |
Left |
|
| |
|
7 |
1 |
|
| 12 u |
36 u |
14 u |
|
|
Cost of 1 pen = 1 u
Cost of 1 pencil = 4 u
Cost of 12 pens = 12 x 1 u = 12 u
Cost of 9 pencils = 9 x 4 u = 36 u
Cost of 12 pens + 9 pencils
= 12 u + 36 u
= 48 u
3 p = 48 u
1 p = 48 u ÷ 3 = 16 u
Amount of remaining money that Gillian spent on buying more pens
=
78 x 16 u
= 14 u
Number of pens that Gillian bought with
78 of her remaining money
= 14 u ÷ 1 u
= 14
Total number of pens that Gillian bought
= 12 + 14
= 26
Answer(s): 26
