Fanny had some pear and orange face masks.
14 of them were pear. She gave away
15 of the pear face masks and
15 of the orange face masks. In the end, she had 32 pear and orange face masks altogether. How many orange face masks did Fanny have at first?
| |
Pear face masks |
Orange face masks |
Total |
Comparing pear and orange face masks
at first |
1x5 =
5 u |
3x5 =
15 u |
4x5 =
20 u |
Before |
5 u |
5x3 =
15 u |
|
Change |
- 1 u |
- 1x3 =
- 3 u |
|
After |
4 u |
4x3 =
12 u |
|
The number of orange face masks at first is repeated. Make the number of orange face masks the same. LCM of 3 and 5 is 15.
Total number of face masks in the end
= 4 u + 12 u
= 16 u
16 u = 32
1 u = 32 ÷ 16 = 2
Number of orange masks at first
= 15 u
= 15 x 2
= 30
Answer(s): 30
