Irene has 4 times as many marbles as Emily. Emily has
47 as many marbles as Zoe. If the three of them have a total of 324 marbles, how many marbles does Zoe have?
Irene |
Emily |
Zoe |
4x4 |
1x4 |
|
|
4x1 |
7x1 |
16 u |
4 u |
7 u |
The number of marbles that Emily has is repeated. Make the number of marbles that Emily has the same. LCM of 1 and 4 is 4.
Total number of marbles that the three of them have
= 16 u + 4 u + 7 u
= 27 u
27 u = 324
1 u = 324 ÷ 27 = 12
Number of marbles that Zoe has
= 7 u
= 7 x 12
= 84
Answer(s): 84