Risa and Julie collected beads. Risa gave 25% of her beads to Julie. As a result, Julie's beads increased by 80%. If Risa had 36 beads left, find the total number of beads the two girls had at first.
| |
Risa |
Julie |
Comparing the change
in Julie's beads |
| Before |
4x4 =
16 u |
|
5x1 =
5 u |
| Change |
- 1x4 =
- 4 u |
+ 1x4 =
+ 4 u |
+ 4x1 =
+ 4 u |
| After |
3x4 =
12 u |
|
9x1 =
9 u |
25% =
25100 =
14 80% =
80100 =
45 The number of beads that Risa gave to Julie is repeated. Make the number of beads that Risa gave to Julie the same. LCM of 1 and 4 is 4.
Number of beads that Risa had in the end = 12 u
12 u = 36
1 u = 36 ÷ 12 = 3
Number of beads that Risa and Julie had at first
= 16 u + 5 u
= 21 u
= 21 x 3
= 63
Answer(s): 63
