PSLE At first, Lucy had 70 stickers and some marbles. After she gave away 57 stickers and 30% of the marbles, she had a total of 69 stickers and marbles. How many marbles did Lucy give away?
|
Stickers |
Marbles |
Total |
Before |
70 |
10 u |
|
Change |
- 57 |
- 3 u |
|
After |
13 |
7 u |
69 |
30% =
30100 =
310 Number of stickers that Lucy left
= 70 - 57
= 13
Number of marbles that Lucy left
= 69 - 13
= 56
7 u = 56
1 u = 56 ÷ 7 = 8
Number of marbles that Lucy gave away
= 3 u
= 3 x 8
= 24
Answer(s): 24