Risa has 2 times as many pencils as Ivory. Ivory has
35 as many pencils as Mary. If the three of them have a total of 112 pencils, how many pencils does Risa have?
Risa |
Ivory |
Mary |
2x3 |
1x3 |
|
|
3x1 |
5x1 |
6 u |
3 u |
5 u |
The number of pencils that Ivory has is repeated. Make the number of pencils that Ivory has the same. LCM of 1 and 3 is 3.
Total number of pencils that the three of them have
= 6 u + 3 u + 5 u
= 14 u
14 u = 112
1 u = 112 ÷ 14 = 8
Number of pencils that Risa has
= 6 u
= 6 x 8
= 48
Answer(s): 48