PSLE At first, Erika had 70 coins and some buttons. After she gave away 40 coins and 25% of the buttons, she had a total of 45 coins and buttons. How many buttons did Erika give away?
|
Coins |
Buttons |
Total |
Before |
70 |
4 u |
|
Change |
- 40 |
- 1 u |
|
After |
30 |
3 u |
45 |
25% =
25100 =
14 Number of coins that Erika left
= 70 - 40
= 30
Number of buttons that Erika left
= 45 - 30
= 15
3 u = 15
1 u = 15 ÷ 3 = 5
Number of buttons that Erika gave away
= 1 u
= 1 x 5
= 5
Answer(s): 5