Risa had 80 more chocolate bars than Gwen. Risa used
67 of her chocolate bars and Gwen used
34 of her chocolate bars. In the end, Risa had 2 times as much as Gwen. Find the number of chocolate bars that Gwen had at first.
| |
Risa |
Gwen |
Comparing Risa
and Parry at first |
80 more |
|
| Before |
7x2 =
14 u |
4 u |
| Change |
- 6x2 =
- 12 u |
- 3 u |
| After |
1x2 =
2 u |
1 u |
Comparing Risa
and Parry in the end |
2 u |
1 u |
The number of chocolate bars that Risa had in the end is repeated. Make the number of chocolate bars that Risa had in the end the same. LCM of 1 and 2 is 2.
Number of chocolate bars that Risa had more than Gwen
= 14 u - 4 u
= 10 u
10 u = 80
1 u = 80 ÷ 10 = 8
Number of chocolate bars that Gwen had at first
= 4 u
= 4 x 8
= 32
Answer(s): 32
