PSLEIrene had a collection of stamps from Finland, Spain and Brunei. She had 96 stamps from Finland. 10% of her stamps were from Spain. She had 16 fewer stamps from Brunei than from Spain.
- What was the total number of stamps in Irene's collection?
- Irene's aunt gave her some stamps from Spain. Her total collection increased by 20%. What percentage of her collection was from Spain after that?
(a)
Finland |
Spain |
Brunei |
Total |
96 |
10% |
10% - 16 |
100% |
|
+ 20% |
|
+ 20% |
|
30% |
|
120% |
Total number of stamps
= 10% + 10% - 16 + 96
= 20% + 80
100% = 20% + 80
100% - 20% = 80
80% = 80
1% = 80 ÷ 80 = 1
Total number of stamps in Irene's collection
= 100%
= 100 x 1
= 100
(b)
Old stamp collection = 100%
New stamp collection = 100% + 20% = 120%
Percentage of stamps from Spain
= 10% + 20%
= 30%
Percentage of her collection from Spain
=
30120 x 100%
= 25%
Answer(s): (a) 100; (b) 25%