Ivory, Rachel and Mary have 540 buttons. Ivory has
45 as many buttons as Rachel. Mary's buttons is
14 of the total number of Ivory's and Rachel's buttons. How many buttons must Rachel give to Mary so that both Ivory and Mary will have the same number of buttons?
Ivory |
Rachel |
Mary |
Total |
4x9 = 36 u |
1x9 = 9 u |
|
4x4 = 16 u |
5x4 = 20 u |
|
|
16 u |
20 u |
9 u |
540 |
Total number of buttons
= 16 u + 20 u + 9 u
= 45 u
45 u = 540
1 u = 540 ÷ 45 = 12
Ivory |
Rachel |
Mary |
Total |
16 u |
20 u |
9 u |
540 |
|
- 7 u |
+ 7 u |
|
16 u |
13 u |
16 u |
540 |
Number of buttons that Rachel must give to Mary
= 16 u - 9 u
= 7 u
= 7 x 12
= 84
Answer(s): 84