Emma and Kylie collected stickers. Emma gave 40% of her stickers to Kylie. As a result, Kylie's stickers increased by 70%. If Emma had 231 stickers left, find the total number of stickers the two girls had at first.
| |
Emma |
Kylie |
Comparing the change
in Kylie's stickers |
| Before |
5x7 =
35 u |
|
10x2 =
20 u |
| Change |
- 2x7 =
- 14 u |
+ 2x7 =
+ 14 u |
+ 7x2 =
+ 14 u |
| After |
3x7 =
21 u |
|
17x2 =
34 u |
40% =
40100 =
25 70% =
70100 =
710 The number of stickers that Emma gave to Kylie is repeated. Make the number of stickers that Emma gave to Kylie the same. LCM of 2 and 7 is 14.
Number of stickers that Emma had in the end = 21 u
21 u = 231
1 u = 231 ÷ 21 = 11
Number of stickers that Emma and Kylie had at first
= 35 u + 20 u
= 55 u
= 55 x 11
= 605
Answer(s): 605
