PSLE At first, Tina had 84 buttons and some cards. After she gave away 54 buttons and 30% of the cards, she had a total of 51 buttons and cards. How many cards did Tina have at first?
|
Buttons |
Cards |
Total |
Before |
84 |
10 u |
|
Change |
- 54 |
- 3 u |
|
After |
30 |
7 u |
51 |
30% =
30100 =
310 Number of buttons that Tina left
= 84 - 54
= 30
Number of cards that Tina left
= 51 - 30
= 21
7 u = 21
1 u = 21 ÷ 7 = 3
Number of cards that Tina had at first
= 10 u
= 10 x 3
= 30
Answer(s): 30