Julie has 2 times as many buttons as Natalie. Natalie has
45 as many buttons as Irene. If the three of them have a total of 170 buttons, how many buttons does Irene have?
Julie |
Natalie |
Irene |
2x4 |
1x4 |
|
|
4x1 |
5x1 |
8 u |
4 u |
5 u |
The number of buttons that Natalie has is repeated. Make the number of buttons that Natalie has the same. LCM of 1 and 4 is 4.
Total number of buttons that the three of them have
= 8 u + 4 u + 5 u
= 17 u
17 u = 170
1 u = 170 ÷ 17 = 10
Number of buttons that Irene has
= 5 u
= 5 x 10
= 50
Answer(s): 50