Cindy had 6 times as many marbles as Natalie at first. After Cindy gave 50 marbles to Natalie, they each had the same number of marbles in the end. How many marbles did Cindy have at first?
| |
Cindy |
Natalie |
| Before |
6 u |
1 u |
| Change |
- 50 |
+ 50 |
| After |
6 u - 50 |
1 u + 50 |
Comparing Cindy and
Natalie in the end |
1 |
1 |
The number of marbles that Cindy and Natalie had in the end is equal.
6 u - 50 = 1 u + 50
6 u - 1 u = 50 + 50
5 u = 100
1 u = 20
Number of marbles that Cindy had at first
= 6 u
= 6 x 20
= 120
Answer(s): 120
