PSLEIrene had a collection of stamps from Russia, Iran and India. She had 132 stamps from Russia. 40% of her stamps were from Iran. She had 12 fewer stamps from India than from Iran.
- What was the total number of stamps in Irene's collection?
- Irene's aunt gave her some stamps from Iran. Her total collection increased by 25%. What percentage of her collection was from Iran after that?
(a)
Russia |
Iran |
India |
Total |
132 |
40% |
40% - 12 |
100% |
|
+ 25% |
|
+ 25% |
|
65% |
|
125% |
Total number of stamps
= 40% + 40% - 12 + 132
= 80% + 120
100% = 80% + 120
100% - 80% = 120
20% = 120
1% = 120 ÷ 20 = 6
Total number of stamps in Irene's collection
= 100%
= 100 x 6
= 600
(b)
Old stamp collection = 100%
New stamp collection = 100% + 25% = 125%
Percentage of stamps from Iran
= 40% + 25%
= 65%
Percentage of her collection from Iran
=
65125 x 100%
= 52%
Answer(s): (a) 600; (b) 52%