Risa has 5 times as many shortbreads as Ivory. The total number of Risa's and Ivory's shortbreads is 3 times of Cindy's. Risa and Ivory have 40 shortbreads more than Cindy's. How many less shortbreads does Cindy have than Risa?
| Risa |
Ivory |
Cindy |
| 5x1 |
1x1 |
|
| 3x2 |
1x2 |
| 5 u |
1 u |
2 u |
The total number of shortbreads that Risa and Ivory have is repeated. Make the total number of shortbreads that Risa and Ivory have the same. LCM of 6 and 3 is 6.
Total number of shortbreads that Risa and Ivory have
= 5 u + 1 u
= 6 u
Number of more shortbreads that Risa and Ivory have than Cindy
= 6 u - 2 u
= 4 u
4 u = 40
1 u = 40 ÷ 4 = 10
Number of less shortbreads that Cindy has than Risa
= 5 u - 2 u
= 3 u
= 3 x 10
= 30
Answer(s): 30
