Cathy has 3 times as many buttons as Ivory. Ivory has
58 as many buttons as Jen. If the three of them have a total of 56 buttons, how many buttons does Jen have?
Cathy |
Ivory |
Jen |
3x5 |
1x5 |
|
|
5x1 |
8x1 |
15 u |
5 u |
8 u |
The number of buttons that Ivory has is repeated. Make the number of buttons that Ivory has the same. LCM of 1 and 5 is 5.
Total number of buttons that the three of them have
= 15 u + 5 u + 8 u
= 28 u
28 u = 56
1 u = 56 ÷ 28 = 2
Number of buttons that Jen has
= 8 u
= 8 x 2
= 16
Answer(s): 16