Lucy had 6 times as many marbles as Fanny at first. After Lucy gave 15 marbles to Fanny, they each had the same number of marbles in the end. How many marbles did Fanny have in the end?
| |
Lucy |
Fanny |
| Before |
6 u |
1 u |
| Change |
- 15 |
+ 15 |
| After |
6 u - 15 |
1 u + 15 |
Comparing Lucy and
Fanny in the end |
1 |
1 |
The number of marbles that Lucy and Fanny had in the end is equal.
6 u - 15 = 1 u + 15
6 u - 1 u = 15 + 15
5 u = 30
1 u = 6
Number of marbles that Fanny had in the end
= 1 u + 15
= 6 + 15
= 21
Answer(s): 21
