Lynn had 17 more puffs than Xandra at first. After Lynn ate 3 puffs, she had thrice as many puffs as Xandra in the end. How many puffs did Xandra have?
| |
Xandra |
Lynn |
| Before |
1 u |
1 u + 17 |
| Change |
|
- 3 |
| After |
1 u |
1 u + 14 |
Comparing Xandra
and Lynn in the end |
1 u |
3 u |
The number of puffs that Xandra had remains unchanged.
Number of puffs that Lynn had in the end
= 3 x 1 u
= 3 u
3 u = 1 u + 14
3 u - 1 u = 14
2 u = 14
1 u = 14 ÷ 2 = 7
Number of puffs that Xandra had
= 1 u
= 7
Answer(s): 7
