PSLESabrina had a collection of stamps from Kenya, Norway and Oman. She had 162 stamps from Kenya. 40% of her stamps were from Norway. She had 22 fewer stamps from Oman than from Norway.
- What was the total number of stamps in Sabrina's collection?
- Sabrina's aunt gave her some stamps from Norway. Her total collection increased by 20%. What percentage of her collection was from Norway after that?
(a)
Kenya |
Norway |
Oman |
Total |
162 |
40% |
40% - 22 |
100% |
|
+ 20% |
|
+ 20% |
|
60% |
|
120% |
Total number of stamps
= 40% + 40% - 22 + 162
= 80% + 140
100% = 80% + 140
100% - 80% = 140
20% = 140
1% = 140 ÷ 20 = 7
Total number of stamps in Sabrina's collection
= 100%
= 100 x 7
= 700
(b)
Old stamp collection = 100%
New stamp collection = 100% + 20% = 120%
Percentage of stamps from Norway
= 40% + 20%
= 60%
Percentage of her collection from Norway
=
60120 x 100%
= 50%
Answer(s): (a) 700; (b) 50%