Zoe had 6 more chocolate bars than Risa. Zoe used
34 of her chocolate bars and Risa used
45 of her chocolate bars. In the end, Zoe had 2 times as much as Risa. Find the number of chocolate bars that Risa had at first.
| |
Zoe |
Risa |
Comparing Zoe
and Parry at first |
6 more |
|
| Before |
4x2 =
8 u |
5 u |
| Change |
- 3x2 =
- 6 u |
- 4 u |
| After |
1x2 =
2 u |
1 u |
Comparing Zoe
and Parry in the end |
2 u |
1 u |
The number of chocolate bars that Zoe had in the end is repeated. Make the number of chocolate bars that Zoe had in the end the same. LCM of 1 and 2 is 2.
Number of chocolate bars that Zoe had more than Risa
= 8 u - 5 u
= 3 u
3 u = 6
1 u = 6 ÷ 3 = 2
Number of chocolate bars that Risa had at first
= 5 u
= 5 x 2
= 10
Answer(s): 10
