In a store, the number of rulers was
27 of the total number of rulers and post-it pads together. Michael sold the rulers and post-it pads in sets of 1 ruler and 4 post-it pads. After selling all the post-it pads, he still had 30 rulers left. How many post-it pads were in the store at first?
| |
Rulers |
Post-it Pads |
| Before |
2x4 =
8 u |
5x4 =
20 u |
| Change |
- 1x5 =
- 5 u |
- 4x5 =
- 20 u |
| After |
30 |
0 |
Since all the post-it pads were sold, the number of post-it pads at first and the number of post-it pads sold were the same. Make the number of post-it pads at first and sold the same. LCM of 5 and 4 is 20.
Number of rulers sold
= 8 u - 5 u
= 3 u
3 u = 30
1 u = 30 ÷ 3 = 10
Number of post-it pads at first
= 20 u
= 20 x 10
= 200
Answer(s): 200
