The ratio of Rael's stickers to Lucas's stickers at first was 3 : 5. After Rael gave Lucas 20 stickers, the ratio of Rael's stickers to Lucas's stickers is 1 : 3. What was the number of stickers they had in total?
| |
Rael |
Lucas |
Total |
| Before |
3x4 =
12 u |
5x4 =
20 u
|
8x4 =
32 u |
| Change |
- 20 |
+ 20 |
|
| After |
1x8 =
8 u |
3x8 =
24 u |
4x8 =
32 u |
Number of stickers that Rael gave Lucas
= 12 u - 8 u
= 4 u
4 u = 20
1 u = 20 ÷ 4 = 5
Total number of stickers that they had
= 32 u
= 32 x 5
= 160
Answer(s): 160
