Zara and Tina collected stamps. Zara gave 10% of her stamps to Tina. As a result, Tina's stamps increased by 60%. If Zara had 108 stamps left, find the total number of stamps the two girls had at first.
| |
Zara |
Tina |
Comparing the change
in Tina's stamps |
| Before |
10x3 =
30 u |
|
5x1 =
5 u |
| Change |
- 1x3 =
- 3 u |
+ 1x3 =
+ 3 u |
+ 3x1 =
+ 3 u |
| After |
9x3 =
27 u |
|
8x1 =
8 u |
10% =
10100 =
110 60% =
60100 =
35 The number of stamps that Zara gave to Tina is repeated. Make the number of stamps that Zara gave to Tina the same. LCM of 1 and 3 is 3.
Number of stamps that Zara had in the end = 27 u
27 u = 108
1 u = 108 ÷ 27 = 4
Number of stamps that Zara and Tina had at first
= 30 u + 5 u
= 35 u
= 35 x 4
= 140
Answer(s): 140
