Luis gave
29 of his marbles to Bobby,
27 of his remaining marbles to Vincent and
25 of the rest of his marbles to Carl. He then had 12 marbles left. How many marbles had he at first?
| Bobby |
Remaining marbles |
Total |
| 2 u |
7 u |
9 u |
| |
Vincent |
Rest of the marbles |
|
| |
2 u |
5 u |
|
| |
|
Carl |
Left |
|
| |
|
2 u |
3 u |
|
| |
|
|
12 |
|
Number of marbles that Luis had before = 9 u
Number of marbles that Luis gave to Bobby = 2 u
Number of marbles that Luis gave to Vincent = 2 u
Number of marbles that Luis gave to Carl = 2 u
Number of marbles that Luis had left = 3 u
3 u = 12
1 u = 12 ÷ 3 = 4
Number of marbles that Luis had at first
= 9 u
= 9 u x 4
= 36
Answer(s): 36
