Betty spent
35 of her money on 9 glues and 3 pencils. The cost of one pencil was twice the cost of one glue. She bought some more pencils with
15 of her remaining money. How many pencils did Betty buy altogether?
9 glues and
3 pencils |
Remaining amount |
| 3x5 |
2x5 |
| |
More pencils |
Left |
| |
1x2 |
4x2 |
| 15 p |
2 p |
8 p |
Cost of 1 glue = 1 u
Cost of 1 pencil = 2 u
Cost of 9 glues = 9 x 1 u = 9 u
Cost of 3 pencils = 3 x 2 u = 6 u
Total cost of 9 glues and 3 pencils
= 9 u + 6 u
= 15 u
15 p = 15 u
1 p = 15 ÷ 15 = 1 u
Amount that Betty used to buy more pencils
= 2 p
= 2 x 1 u
= 2 u
Number of more pencils that Betty bought
= 2 u ÷ 2 u
= 1
Total number of pencils that Betty bought
= 3 + 1
= 4
Answer(s): 4
