Zara had some kiwi and chikoo face masks.
13 of them were kiwi. She gave away
13 of the kiwi face masks and
16 of the chikoo face masks. In the end, she had 84 kiwi and chikoo face masks altogether. How many chikoo face masks did Zara have at first?
| |
Kiwi face masks |
Chikoo face masks |
Total |
Comparing kiwi and chikoo 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 chikoo face masks at first is repeated. Make the number of chikoo 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 = 84
1 u = 84 ÷ 7 = 12
Number of chikoo masks at first
= 6 u
= 6 x 12
= 72
Answer(s): 72
