PSLEYoko had a collection of stamps from France, Ireland and Canada. She had 140 stamps from France. 40% of her stamps were from Ireland. She had 20 fewer stamps from Canada than from Ireland.
- What was the total number of stamps in Yoko's collection?
- Yoko's aunt gave her some stamps from Ireland. Her total collection increased by 20%. What percentage of her collection was from Ireland after that?
(a)
France |
Ireland |
Canada |
Total |
140 |
40% |
40% - 20 |
100% |
|
+ 20% |
|
+ 20% |
|
60% |
|
120% |
Total number of stamps
= 40% + 40% - 20 + 140
= 80% + 120
100% = 80% + 120
100% - 80% = 120
20% = 120
1% = 120 ÷ 20 = 6
Total number of stamps in Yoko's collection
= 100%
= 100 x 6
= 600
(b)
Old stamp collection = 100%
New stamp collection = 100% + 20% = 120%
Percentage of stamps from Ireland
= 40% + 20%
= 60%
Percentage of her collection from Ireland
=
60120 x 100%
= 50%
Answer(s): (a) 600; (b) 50%