Zara, Marion, Albert and Nora shared some marbles. Zara and Marion took
15 of the total number of marbles while Albert and Nora took the rest. Marion had thrice as many marbles as Zara and Nora had 12 marbles. Given that Nora had twice as many marbles as Marion, how many marbles were there altogether?
Zara |
Marion |
Albert |
Nora |
Total |
1x4 |
4x4 |
5x4 |
1 |
3 |
|
|
|
|
1x3 |
|
2x3 |
|
1 u |
3 u |
10 u |
6 u |
20 u |
Number of marbles that Marion had is repeated. Make the number of marbles that Marion had the same. LCM of 3 and 1 is 3.
Number of marbles that Nora had = 6 u
6 u = 12
1 u = 12 ÷ 6 = 2
Total number of marbles
= 20 u
= 20 x 2
= 40
Answer(s): 40