Usha has 2 times as many buttons as Dana. Dana has
27 as many buttons as Elyse. If the three of them have a total of 78 buttons, how many buttons does Elyse have?
Usha |
Dana |
Elyse |
2x2 |
1x2 |
|
|
2x1 |
7x1 |
4 u |
2 u |
7 u |
The number of buttons that Dana has is repeated. Make the number of buttons that Dana has the same. LCM of 1 and 2 is 2.
Total number of buttons that the three of them have
= 4 u + 2 u + 7 u
= 13 u
13 u = 78
1 u = 78 ÷ 13 = 6
Number of buttons that Elyse has
= 7 u
= 7 x 6
= 42
Answer(s): 42