Sarah has 3 times as many marbles as Xylia. Xylia has
57 as many marbles as Linda. If the three of them have a total of 81 marbles, how many marbles does Sarah have?
| Sarah |
Xylia |
Linda |
| 3x5 |
1x5 |
|
| |
5x1 |
7x1 |
| 15 u |
5 u |
7 u |
The number of marbles that Xylia has is repeated. Make the number of marbles that Xylia has the same. LCM of 1 and 5 is 5.
Total number of marbles that the three of them have
= 15 u + 5 u + 7 u
= 27 u
27 u = 81
1 u = 81 ÷ 27 = 3
Number of marbles that Sarah has
= 15 u
= 15 x 3
= 45
Answer(s): 45
