Shiyun spent
25 of her money on 2 correction tapes and 9 pencils. The cost of one pencil was twice the cost of one correction tape. She bought some more pencils with
15 of her remaining money. How many pencils did Shiyun buy altogether?
2 correction tapes and
9 pencils |
Remaining amount |
| 2x5 |
3x5 |
| |
More pencils |
Left |
| |
1x3 |
4x3 |
| 10 p |
3 p |
12 p |
Cost of 1 correction tape = 1 u
Cost of 1 pencil = 2 u
Cost of 2 correction tapes = 2 x 1 u = 2 u
Cost of 9 pencils = 9 x 2 u = 18 u
Total cost of 2 correction tapes and 9 pencils
= 2 u + 18 u
= 20 u
10 p = 20 u
1 p = 20 ÷ 10 = 2 u
Amount that Shiyun used to buy more pencils
= 3 p
= 3 x 2 u
= 6 u
Number of more pencils that Shiyun bought
= 6 u ÷ 2 u
= 3
Total number of pencils that Shiyun bought
= 9 + 3
= 12
Answer(s): 12
