Tina, Gillian, David and Tiffany shared some marbles. Tina and Gillian took
15 of the total number of marbles while David and Tiffany took the rest. Gillian had twice as many marbles as Tina and Tiffany had 12 marbles. Given that Tiffany had twice as many marbles as Gillian, how many marbles were there altogether?
| Tina |
Gillian |
David |
Tiffany |
Total |
| 1x3 |
4x3 |
5x3 |
| 1 |
2 |
|
|
|
| |
1x2 |
|
2x2 |
|
| 1 u |
2 u |
8 u |
4 u |
15 u |
Number of marbles that Gillian had is repeated. Make the number of marbles that Gillian had the same. LCM of 2 and 1 is 2.
Number of marbles that Tiffany had = 4 u
4 u = 12
1 u = 12 ÷ 4 = 3
Total number of marbles
= 15 u
= 15 x 3
= 45
Answer(s): 45
