Yen had some persimmon and pomegranate face masks.
13 of them were persimmon. She gave away
15 of the persimmon face masks and
15 of the pomegranate face masks. In the end, she had 144 persimmon and pomegranate face masks altogether. How many pomegranate face masks did Yen have at first?
| |
Persimmon face masks |
Pomegranate face masks |
Total |
Comparing persimmon and pomegranate 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 pomegranate face masks at first is repeated. Make the number of pomegranate 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 = 144
1 u = 144 ÷ 12 = 12
Number of pomegranate masks at first
= 10 u
= 10 x 12
= 120
Answer(s): 120
