Irene had some starfruit and pear face masks.
14 of them were starfruit. She gave away
12 of the starfruit face masks and
16 of the pear face masks. In the end, she had 18 starfruit and pear face masks altogether. How many pear face masks did Irene have at first?
| |
Starfruit face masks |
Pear face masks |
Total |
Comparing starfruit and pear face masks
at first |
1x2 =
2 u |
3x2 =
6 u |
4x2 =
8 u |
Before |
2 u |
6x1 =
6 u |
|
Change |
- 1 u |
- 1x1 =
- 1 u |
|
After |
1 u |
5x1 =
5 u |
|
The number of pear face masks at first is repeated. Make the number of pear face masks the same. LCM of 3 and 6 is 6.
Total number of face masks in the end
= 1 u + 5 u
= 6 u
6 u = 18
1 u = 18 ÷ 6 = 3
Number of pear masks at first
= 6 u
= 6 x 3
= 18
Answer(s): 18
