Yoko had some pear and persimmon face masks.
15 of them were pear. She gave away
13 of the pear face masks and
16 of the persimmon face masks. In the end, she had 156 pear and persimmon face masks altogether. How many persimmon face masks did Yoko have at first?
| |
Pear face masks |
Persimmon face masks |
Total |
Comparing pear and persimmon face masks
at first |
1x3 =
3 u |
4x3 =
12 u |
5x3 =
15 u |
Before |
3 u |
6x2 =
12 u |
|
Change |
- 1 u |
- 1x2 =
- 2 u |
|
After |
2 u |
5x2 =
10 u |
|
The number of persimmon face masks at first is repeated. Make the number of persimmon face masks the same. LCM of 4 and 6 is 12.
Total number of face masks in the end
= 2 u + 10 u
= 12 u
12 u = 156
1 u = 156 ÷ 12 = 13
Number of persimmon masks at first
= 12 u
= 12 x 13
= 156
Answer(s): 156
