Kathy had some pear and starfruit face masks.
13 of them were pear. She gave away
13 of the pear face masks and
16 of the starfruit face masks. In the end, she had 63 pear and starfruit face masks altogether. How many starfruit face masks did Kathy have at first?
| |
Pear face masks |
Starfruit face masks |
Total |
Comparing pear and starfruit 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 starfruit face masks at first is repeated. Make the number of starfruit 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 = 63
1 u = 63 ÷ 7 = 9
Number of starfruit masks at first
= 6 u
= 6 x 9
= 54
Answer(s): 54
