Lucy and Jen collected stickers. Lucy gave 10% of her stickers to Jen. As a result, Jen's stickers increased by 70%. If Lucy had 252 stickers left, find the total number of stickers the two girls had at first.
| |
Lucy |
Jen |
Comparing the change
in Jen's stickers |
| Before |
10x7 =
70 u |
|
10x1 =
10 u |
| Change |
- 1x7 =
- 7 u |
+ 1x7 =
+ 7 u |
+ 7x1 =
+ 7 u |
| After |
9x7 =
63 u |
|
17x1 =
17 u |
10% =
10100 =
110 70% =
70100 =
710 The number of stickers that Lucy gave to Jen is repeated. Make the number of stickers that Lucy gave to Jen the same. LCM of 1 and 7 is 7.
Number of stickers that Lucy had in the end = 63 u
63 u = 252
1 u = 252 ÷ 63 = 4
Number of stickers that Lucy and Jen had at first
= 70 u + 10 u
= 80 u
= 80 x 4
= 320
Answer(s): 320
