Linda and Joelle had an equal number of pens at first. Linda used
13 of her pens and Joelle used
18 of her pens. They used 55 pens altogether. How many pens did Joelle have in the end?
| |
Linda |
Joelle |
| Before |
3x8 =
24 u |
8x3 =
24 u |
| Change |
- 1x8 =
- 8 u |
- 1x3 =
- 3 u |
| After |
2x8 =
16 u |
7x3 =
21 u |
The number of pens that Linda and Joelle each had at first is the same. Make the number of pens that Linda and Joelle each had at first the same. LCM of 3 and 8 is 24.
Number of pens that Linda and Joelle used
= 8 u + 3 u
= 11 u
11 u = 55
1 u = 55 ÷ 11 = 5
Number of pens that Joelle had in the end
= 21 u
= 21 x 5
= 105
Answer(s): 105
