PSLEErika had a collection of stamps from Ireland, Korea and Thailand. She had 189 stamps from Ireland. 10% of her stamps were from Korea. She had 29 fewer stamps from Thailand than from Korea.
- What was the total number of stamps in Erika's collection?
- Erika's aunt gave her some stamps from Korea. Her total collection increased by 25%. What percentage of her collection was from Korea after that?
(a)
Ireland |
Korea |
Thailand |
Total |
189 |
10% |
10% - 29 |
100% |
|
+ 25% |
|
+ 25% |
|
35% |
|
125% |
Total number of stamps
= 10% + 10% - 29 + 189
= 20% + 160
100% = 20% + 160
100% - 20% = 160
80% = 160
1% = 160 ÷ 80 = 2
Total number of stamps in Erika's collection
= 100%
= 100 x 2
= 200
(b)
Old stamp collection = 100%
New stamp collection = 100% + 25% = 125%
Percentage of stamps from Korea
= 10% + 25%
= 35%
Percentage of her collection from Korea
=
35125 x 100%
= 28%
Answer(s): (a) 200; (b) 28%