Cathy and Jane had an equal number of stickers at first. Cathy used
13 of her stickers and Jane used
19 of her stickers. They used 20 stickers altogether. How many stickers did Jane have in the end?
| |
Cathy |
Jane |
| Before |
3x3 =
9 u |
9x1 =
9 u |
| Change |
- 1x3 =
- 3 u |
- 1x1 =
- 1 u |
| After |
2x3 =
6 u |
8x1 =
8 u |
The number of stickers that Cathy and Jane each had at first is the same. Make the number of stickers that Cathy and Jane each had at first the same. LCM of 3 and 9 is 9.
Number of stickers that Cathy and Jane used
= 3 u + 1 u
= 4 u
4 u = 20
1 u = 20 ÷ 4 = 5
Number of stickers that Jane had in the end
= 8 u
= 8 x 5
= 40
Answer(s): 40
