Mary and Shannon shared some earpins. Mary's share was 40% of Shannon's share. She then increased her share of the earpins by taking 20% of Shannon's share. Given that Mary had 30 fewer earpins than Shannon in the end, how many earpins did the girls have altogether?
| |
Mary |
Shannon |
Difference |
Total |
| Before |
2 u |
5 u |
|
7 u |
| Change |
+ 1 u |
- 1 u |
|
|
| After |
3 u |
4 u |
1 u |
7 u |
40% =
40100 =
25Number of earpins that Mary took from Shannon
= 20% x 5 u
=
20100 x 5 u
= 1 u
Number of fewer earpins that Mary had than Shannon in the end = 1 u
1 u = 30
1 u = 30 ÷ 1 = 30
Total number of earpins that the girls had
= 7 u
= 7 x 30
= 210
Answer(s): 210
