Fanny has 3 times as many buttons as Esther. Esther has
38 as many buttons as Usha. If the three of them have a total of 100 buttons, how many buttons does Usha have?
| Fanny |
Esther |
Usha |
| 3x3 |
1x3 |
|
| |
3x1 |
8x1 |
| 9 u |
3 u |
8 u |
The number of buttons that Esther has is repeated. Make the number of buttons that Esther has the same. LCM of 1 and 3 is 3.
Total number of buttons that the three of them have
= 9 u + 3 u + 8 u
= 20 u
20 u = 100
1 u = 100 ÷ 20 = 5
Number of buttons that Usha has
= 8 u
= 8 x 5
= 40
Answer(s): 40
