Eva had some starfruit and chikoo face masks.
15 of them were starfruit. She gave away
13 of the starfruit face masks and
13 of the chikoo face masks. In the end, she had 70 starfruit and chikoo face masks altogether. How many chikoo face masks did Eva have at first?
| |
Starfruit face masks |
Chikoo face masks |
Total |
Comparing starfruit and chikoo 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 chikoo face masks at first is repeated. Make the number of chikoo 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 = 70
1 u = 70 ÷ 10 = 7
Number of chikoo masks at first
= 12 u
= 12 x 7
= 84
Answer(s): 84
