Mary had some mango and chikoo face masks.
15 of them were mango. She gave away
13 of the mango face masks and
16 of the chikoo face masks. In the end, she had 180 mango and chikoo face masks altogether. How many chikoo face masks did Mary have at first?
| |
Mango face masks |
Chikoo face masks |
Total |
Comparing mango and chikoo face masks
at first |
1x3 =
3 u |
4x3 =
12 u |
5x3 =
15 u |
Before |
3 u |
6x2 =
12 u |
|
Change |
- 1 u |
- 1x2 =
- 2 u |
|
After |
2 u |
5x2 =
10 u |
|
The number of chikoo face masks at first is repeated. Make the number of chikoo face masks the same. LCM of 4 and 6 is 12.
Total number of face masks in the end
= 2 u + 10 u
= 12 u
12 u = 180
1 u = 180 ÷ 12 = 15
Number of chikoo masks at first
= 12 u
= 12 x 15
= 180
Answer(s): 180
