Min had some kiwi and persimmon face masks.
13 of them were kiwi. She gave away
13 of the kiwi face masks and
16 of the persimmon face masks. In the end, she had 77 kiwi and persimmon face masks altogether. How many persimmon face masks did Min have at first?
| |
Kiwi face masks |
Persimmon face masks |
Total |
Comparing kiwi and persimmon face masks
at first |
1x3 =
3 u |
2x3 =
6 u |
3x3 =
9 u |
Before |
3 u |
6x1 =
6 u |
|
Change |
- 1 u |
- 1x1 =
- 1 u |
|
After |
2 u |
5x1 =
5 u |
|
The number of persimmon face masks at first is repeated. Make the number of persimmon face masks the same. LCM of 2 and 6 is 6.
Total number of face masks in the end
= 2 u + 5 u
= 7 u
7 u = 77
1 u = 77 ÷ 7 = 11
Number of persimmon masks at first
= 6 u
= 6 x 11
= 66
Answer(s): 66
