Albert gave
16 of his marbles to Ian,
25 of his remaining marbles to Cody and
13 of the rest of his marbles to Sean. He then had 30 marbles left. How many marbles had he at first?
| Ian |
Remaining marbles |
Total |
| 1 u |
5 u |
6 u |
| |
Cody |
Rest of the marbles |
|
| |
2 u |
3 u |
|
| |
|
Sean |
Left |
|
| |
|
1 u |
2 u |
|
| |
|
|
30 |
|
Number of marbles that Albert had before = 6 u
Number of marbles that Albert gave to Ian = 1 u
Number of marbles that Albert gave to Cody = 2 u
Number of marbles that Albert gave to Sean = 1 u
Number of marbles that Albert had left = 2 u
2 u = 30
1 u = 30 ÷ 2 = 15
Number of marbles that Albert had at first
= 6 u
= 6 u x 15
= 90
Answer(s): 90
