Tina has 3 times as many erasers as Kimberly. Kimberly has
67 as many erasers as Mary. If the three of them have a total of 341 erasers, how many erasers does Mary have?
Tina |
Kimberly |
Mary |
3x6 |
1x6 |
|
|
6x1 |
7x1 |
18 u |
6 u |
7 u |
The number of erasers that Kimberly has is repeated. Make the number of erasers that Kimberly has the same. LCM of 1 and 6 is 6.
Total number of erasers that the three of them have
= 18 u + 6 u + 7 u
= 31 u
31 u = 341
1 u = 341 ÷ 31 = 11
Number of erasers that Mary has
= 7 u
= 7 x 11
= 77
Answer(s): 77