Tammy had 80 less chocolate bars than Risa. Risa used
45 of her chocolate bars and Tammy used
45 of her chocolate bars. In the end, Risa had 3 times as much as Tammy. Find the number of chocolate bars that Risa had at first.
| |
Risa |
Tammy |
Comparing Risa
and Parry at first |
|
80 less |
| Before |
5x3 =
15 u |
5 u |
| Change |
- 4x3 =
- 12 u |
- 4 u |
| After |
1x3 =
3 u |
1 u |
Comparing Risa
and Parry in the end |
3 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 3 is 3.
Number of chocolate bars that Tammy had less than Risa
= 15 u - 5 u
= 10 u
10 u = 80
1 u = 80 ÷ 10 = 8
Number of chocolate bars that Risa had at first
= 15 u
= 15 x 8
= 120
Answer(s): 120
