Gillian had some passion fruit and starfruit face masks.
13 of them were passion fruit. She gave away
15 of the passion fruit face masks and
15 of the starfruit face masks. In the end, she had 156 passion fruit and starfruit face masks altogether. How many starfruit face masks did Gillian have at first?
| |
Passion Fruit face masks |
Starfruit face masks |
Total |
Comparing passion fruit and starfruit 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 starfruit face masks at first is repeated. Make the number of starfruit 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 = 156
1 u = 156 ÷ 12 = 13
Number of starfruit masks at first
= 10 u
= 10 x 13
= 130
Answer(s): 130
