Nora has 3 times as many erasers as Opal. Opal has
35 as many erasers as Diana. If the three of them have a total of 85 erasers, how many erasers does Diana have?
| Nora |
Opal |
Diana |
| 3x3 |
1x3 |
|
| |
3x1 |
5x1 |
| 9 u |
3 u |
5 u |
The number of erasers that Opal has is repeated. Make the number of erasers that Opal has the same. LCM of 1 and 3 is 3.
Total number of erasers that the three of them have
= 9 u + 3 u + 5 u
= 17 u
17 u = 85
1 u = 85 ÷ 17 = 5
Number of erasers that Diana has
= 5 u
= 5 x 5
= 25
Answer(s): 25
