Vanessa had some mango and starfruit face masks.
15 of them were mango. She gave away
13 of the mango face masks and
13 of the starfruit face masks. In the end, she had 140 mango and starfruit face masks altogether. How many starfruit face masks did Vanessa have at first?
| |
Mango face masks |
Starfruit face masks |
Total |
Comparing mango and starfruit face masks
at first |
1x3 =
3 u |
4x3 =
12 u |
5x3 =
15 u |
Before |
3 u |
3x4 =
12 u |
|
Change |
- 1 u |
- 1x4 =
- 4 u |
|
After |
2 u |
2x4 =
8 u |
|
The number of starfruit face masks at first is repeated. Make the number of starfruit face masks the same. LCM of 4 and 3 is 12.
Total number of face masks in the end
= 2 u + 8 u
= 10 u
10 u = 140
1 u = 140 ÷ 10 = 14
Number of starfruit masks at first
= 12 u
= 12 x 14
= 168
Answer(s): 168
