Erika and Mary shared some earpins. Erika's share was 30% of Mary's share. She then increased her share of the earpins by taking 20% of Mary's share. Given that Erika had 39 fewer earpins than Mary in the end, how many earpins did the girls have altogether?
| |
Erika |
Mary |
Difference |
Total |
| Before |
3 u |
10 u |
|
13 u |
| Change |
+ 2 u |
- 2 u |
|
|
| After |
5 u |
8 u |
3 u |
13 u |
30% =
30100 =
310Number of earpins that Erika took from Mary
= 20% x 10 u
=
20100 x 10 u
= 2 u
Number of fewer earpins that Erika had than Mary in the end = 3 u
3 u = 39
1 u = 39 ÷ 3 = 13
Total number of earpins that the girls had
= 13 u
= 13 x 13
= 169
Answer(s): 169
