Xylia had some apple and pear face masks.
16 of them were apple. She gave away
14 of the apple face masks and
14 of the pear face masks. In the end, she had 270 apple and pear face masks altogether. How many pear face masks did Xylia have at first?
| |
Apple face masks |
Pear face masks |
Total |
Comparing apple and pear face masks
at first |
1x4 =
4 u |
5x4 =
20 u |
6x4 =
24 u |
Before |
4 u |
4x5 =
20 u |
|
Change |
- 1 u |
- 1x5 =
- 5 u |
|
After |
3 u |
3x5 =
15 u |
|
The number of pear face masks at first is repeated. Make the number of pear face masks the same. LCM of 5 and 4 is 20.
Total number of face masks in the end
= 3 u + 15 u
= 18 u
18 u = 270
1 u = 270 ÷ 18 = 15
Number of pear masks at first
= 20 u
= 20 x 15
= 300
Answer(s): 300
