Nicole had some persimmon and kiwi face masks.
13 of them were persimmon. She gave away
15 of the persimmon face masks and
15 of the kiwi face masks. In the end, she had 24 persimmon and kiwi face masks altogether. How many kiwi face masks did Nicole have at first?
| |
Persimmon face masks |
Kiwi face masks |
Total |
Comparing persimmon and kiwi face masks
at first |
1x5 =
5 u |
2x5 =
10 u |
3x5 =
15 u |
Before |
5 u |
5x2 =
10 u |
|
Change |
- 1 u |
- 1x2 =
- 2 u |
|
After |
4 u |
4x2 =
8 u |
|
The number of kiwi face masks at first is repeated. Make the number of kiwi face masks the same. LCM of 2 and 5 is 10.
Total number of face masks in the end
= 4 u + 8 u
= 12 u
12 u = 24
1 u = 24 ÷ 12 = 2
Number of kiwi masks at first
= 10 u
= 10 x 2
= 20
Answer(s): 20
