Erika and Lynn shared a box of coins. Erika had 70% of the total coins. if Erika gave 120 of her coins to Lynn, both would have the same number of coins. How many coins did Erika have?
| |
Erika |
Lynn |
Total |
| Before |
70% |
30% |
100% |
| Change |
- 20% |
+ 20% |
|
| After |
50% |
50% |
100% |
Total number of coins that Erika and Lynn shared = 100%
If Erika gave 120 coins to Lynn, both would have the same number of coins.
Number of coins that each would have in the end
= 100% ÷ 2
= 50%
Number of coins that Erika gave to Lynn
= 70% - 50%
= 20%
20% → 120
1% → 120 ÷ 20 = 6
Number of coins that Erika had
= 70%
= 70 x 6
= 420
Answer(s): 420
