Betty has 3 times as many erasers as Sarah. Sarah has
34 as many erasers as Xuan. If the three of them have a total of 64 erasers, how many erasers does Xuan have?
| Betty |
Sarah |
Xuan |
| 3x3 |
1x3 |
|
| |
3x1 |
4x1 |
| 9 u |
3 u |
4 u |
The number of erasers that Sarah has is repeated. Make the number of erasers that Sarah has the same. LCM of 1 and 3 is 3.
Total number of erasers that the three of them have
= 9 u + 3 u + 4 u
= 16 u
16 u = 64
1 u = 64 ÷ 16 = 4
Number of erasers that Xuan has
= 4 u
= 4 x 4
= 16
Answer(s): 16
